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sovereign state A sovereign state or sovereign country, is a polity, political entity represented by one central government that has supreme legitimate authority over territory. International law defines sovereign states as having a permanent population, defin ...
s have publicly announced successful detonation of
nuclear weapon A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions ( thermonuclear bomb), producing a nuclear explosion. Both bom ...
s.
Five 5 is a number, numeral, and glyph. 5, five or number 5 may also refer to: * AD 5, the fifth year of the AD era * 5 BC, the fifth year before the AD era Literature * ''5'' (visual novel), a 2008 visual novel by Ram * ''5'' (comics), an awa ...
are considered to be nuclear-weapon states (NWS) under the terms of the
Treaty on the Non-Proliferation of Nuclear Weapons The Treaty on the Non-Proliferation of Nuclear Weapons, commonly known as the Non-Proliferation Treaty or NPT, is an international treaty whose objective is to prevent the spread of nuclear weapons and weapons technology, to promote cooperation ...
(NPT). In order of acquisition of nuclear weapons, these are the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
,
Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...
(the successor of the
former A former is an object, such as a template, gauge or cutting die, which is used to form something such as a boat's hull. Typically, a former gives shape to a structure that may have complex curvature. A former may become an integral part of the ...
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...
), the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North ...
,
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
, and
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
. Other states that possess nuclear weapons are
India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...
,
Pakistan Pakistan ( ur, ), officially the Islamic Republic of Pakistan ( ur, , label=none), is a country in South Asia. It is the world's List of countries and dependencies by population, fifth-most populous country, with a population of almost 24 ...
, and
North Korea North Korea, officially the Democratic People's Republic of Korea (DPRK), is a country in East Asia. It constitutes the northern half of the Korea, Korean Peninsula and shares borders with China and Russia to the north, at the Yalu River, Y ...
. Since the NPT entered into force in 1970, these three states were not parties to the Treaty and have conducted overt
nuclear tests Nuclear weapons tests are experiments carried out to determine nuclear weapons' effectiveness, yield, and explosive capability. Testing nuclear weapons offers practical information about how the weapons function, how detonations are affected by ...
. North Korea had been a party to the NPT but withdrew in 2003.
Israel Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated ...
is also generally understood to have nuclear weapons, but does not acknowledge it, maintaining a
policy of deliberate ambiguity A policy of deliberate ambiguity (also known as a policy of strategic ambiguity, ''strategic uncertainty'') is the practice by a government of being intentionally ambiguous on certain aspects of its foreign policy. It may be useful if the country ...
. Israel is estimated to possess somewhere between 75 and 400 nuclear warheads.Nuclear Forces
,
Stockholm International Peace Research Institute Stockholm International Peace Research Institute (SIPRI) is an international institute based in Stockholm. It was founded in 1966 and provides data, analysis and recommendations for armed conflict, military expenditure and arms trade as well a ...
, sipri.org
One possible motivation for ''nuclear ambiguity'' is
deterrence Deterrence may refer to: * Deterrence theory, a theory of war, especially regarding nuclear weapons * Deterrence (penology), a theory of justice * Deterrence (psychology), a psychological theory * ''Deterrence'' (film), a 1999 drama starring Kev ...
with minimum political cost. States that formerly possessed nuclear weapons are
South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
(developed nuclear weapons but then disassembled its arsenal before joining the NPT) and the former Soviet republics of
Belarus Belarus,, , ; alternatively and formerly known as Byelorussia (from Russian ). officially the Republic of Belarus,; rus, Республика Беларусь, Respublika Belarus. is a landlocked country in Eastern Europe. It is bordered by R ...
,
Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...
, and
Ukraine Ukraine ( uk, Україна, Ukraïna, ) is a country in Eastern Europe. It is the second-largest European country after Russia, which it borders to the east and northeast. Ukraine covers approximately . Prior to the ongoing Russian inv ...
, whose weapons were repatriated to Russia. According to
Stockholm International Peace Research Institute Stockholm International Peace Research Institute (SIPRI) is an international institute based in Stockholm. It was founded in 1966 and provides data, analysis and recommendations for armed conflict, military expenditure and arms trade as well a ...
(SIPRI), the worldwide total inventory of nuclear weapons as of 2021 stood at 13,080. Around 30% of these are deployed with operational forces, and more than 90% are owned by either Russia or the United States.


Statistics and force configuration

The following is a list of states that have admitted the possession of
nuclear weapon A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions ( thermonuclear bomb), producing a nuclear explosion. Both bom ...
s or are presumed to possess them, the approximate number of
warhead A warhead is the forward section of a device that contains the explosive agent or toxic (biological, chemical, or nuclear) material that is delivered by a missile, rocket, torpedo, or bomb. Classification Types of warheads include: * Explosiv ...
s under their control, and the year they tested their first weapon and their force configuration. This list is informally known in global politics as the "Nuclear Club". With the exception of Russia and the United States (which have subjected their nuclear forces to independent verification under various treaties) these figures are estimates, in some cases quite unreliable estimates. In particular, under the
Strategic Offensive Reductions Treaty The Treaty Between the United States of America and the Russian Federation on Strategic Offensive Reductions (SORT), also known as the Treaty of Moscow, was a strategic arms reduction treaty between the United States and Russia that was in fo ...
thousands of Russian and U.S. nuclear warheads are inactive in stockpiles awaiting processing. The fissile material contained in the warheads can then be recycled for use in
nuclear reactors A nuclear reactor is a device used to initiate and control a fission nuclear chain reaction or nuclear fusion reactions. Nuclear reactors are used at nuclear power plants for electricity generation and in nuclear marine propulsion. Heat from nu ...
. From a high of 70,300 active weapons in 1986, there are approximately 3,750 active nuclear warheads and 13,890 total nuclear warheads in the world. Many of the decommissioned weapons were simply stored or partially dismantled, not destroyed. It is also noteworthy that since the dawn of the
Atomic Age The Atomic Age, also known as the Atomic Era, is the period of history following the detonation of the first nuclear weapon, The Gadget at the ''Trinity'' test in New Mexico, on July 16, 1945, during World War II. Although nuclear chain reactio ...
, the delivery methods of most states with nuclear weapons has evolved—with some achieving a
nuclear triad A nuclear triad is a three-pronged military force structure that consists of land-launched nuclear missiles, nuclear-missile-armed submarines, and strategic aircraft with nuclear bombs and missiles. Specifically, these components are land-based ...
, while others have consolidated away from land and air deterrents to submarine-based forces.


Recognized nuclear-weapon states

These five states are known to have detonated a nuclear explosive before 1 January 1967 and are thus nuclear weapons states under the
Treaty on the Non-Proliferation of Nuclear Weapons The Treaty on the Non-Proliferation of Nuclear Weapons, commonly known as the Non-Proliferation Treaty or NPT, is an international treaty whose objective is to prevent the spread of nuclear weapons and weapons technology, to promote cooperation ...
. They also happen to be the
UN Security Council The United Nations Security Council (UNSC) is one of the six principal organs of the United Nations (UN) and is charged with ensuring international peace and security, recommending the admission of new UN members to the General Assembly, and ...
's (UNSC) permanent members with
veto power A veto is a legal power to unilaterally stop an official action. In the most typical case, a president or monarch vetoes a bill to stop it from becoming law. In many countries, veto powers are established in the country's constitution. Veto pow ...
on UNSC resolutions.


United States

The United States developed the first nuclear weapons during
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
in cooperation with the United Kingdom and Canada as part of the
Manhattan Project The Manhattan Project was a research and development undertaking during World War II that produced the first nuclear weapons. It was led by the United States with the support of the United Kingdom and Canada. From 1942 to 1946, the project w ...
, out of the fear that
Nazi Germany Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was ...
would develop them first. It tested the first nuclear weapon on 16 July 1945 ("
Trinity The Christian doctrine of the Trinity (, from 'threefold') is the central dogma concerning the nature of God in most Christian churches, which defines one God existing in three coequal, coeternal, consubstantial divine persons: God the F ...
") at 5:30 am, and remains the only country to have used nuclear weapons in war, devastating the Japanese cities of
Hiroshima is the capital of Hiroshima Prefecture in Japan. , the city had an estimated population of 1,199,391. The gross domestic product (GDP) in Greater Hiroshima, Hiroshima Urban Employment Area, was US$61.3 billion as of 2010. Kazumi Matsui h ...
and
Nagasaki is the capital and the largest city of Nagasaki Prefecture on the island of Kyushu in Japan. It became the sole port used for trade with the Portuguese and Dutch during the 16th through 19th centuries. The Hidden Christian Sites in the ...
. The project expenditure through 1 October 1945 was reportedly $1.845-$2 billion, in nominal terms, roughly 0.8 percent of the US GDP in 1945 and equivalent to about $29 billion in 2020 money. It was the first nation to develop the
hydrogen bomb A thermonuclear weapon, fusion weapon or hydrogen bomb (H bomb) is a second-generation nuclear weapon design. Its greater sophistication affords it vastly greater destructive power than first-generation nuclear bombs, a more compact size, a lowe ...
, testing an experimental prototype in 1952 ("
Ivy Mike Ivy Mike was the codename given to the first full-scale test of a thermonuclear device, in which part of the explosive yield comes from nuclear fusion. Ivy Mike was detonated on November 1, 1952, by the United States on the island of Elugelab in ...
") and a deployable weapon in 1954 ("
Castle Bravo Castle Bravo was the first in a series of high-yield thermonuclear weapon design tests conducted by the United States at Bikini Atoll, Marshall Islands, as part of ''Operation Castle''. Detonated on March 1, 1954, the device was the most powerful ...
"). Throughout the
Cold War The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term '' cold war'' is used because the ...
it continued to modernize and enlarge its nuclear arsenal, but from 1992 on has been involved primarily in a program of
Stockpile stewardship Stockpile stewardship refers to the United States program of reliability testing and maintenance of its nuclear weapons without the use of nuclear testing. Because no new nuclear weapons have been developed by the United States since 1992, even i ...
. The U.S. nuclear arsenal contained 31,175 warheads at its Cold War height (in 1966). During the Cold War, the United States built approximately 70,000 nuclear warheads, more than all other nuclear-weapon states combined.Robert S. Norris and Hans M. Kristensen,
Global nuclear stockpiles, 1945–2006
" Bulletin of the Atomic Scientists 62, no. 4 (July/August 2006), 64–66...


Russia (successor to the Soviet Union)

The Soviet Union tested its first nuclear weapon ("
RDS-1 The RDS-1 (russian: РДС-1), also known as Izdeliye 501 (device 501) and First Lightning (), was the nuclear bomb used in the Soviet Union's first nuclear weapon test. The United States assigned it the code-name Joe-1, in reference to Joseph S ...
") in 1949. This crash project was developed partially with information obtained via
espionage Espionage, spying, or intelligence gathering is the act of obtaining secret or confidential information (intelligence) from non-disclosed sources or divulging of the same without the permission of the holder of the information for a tangibl ...
during and after World War II. The Soviet Union was the second nation to have developed and tested a nuclear weapon. The direct motivation for Soviet weapons development was to achieve a balance of power during the Cold War. It tested its first megaton-range hydrogen bomb ("
RDS-37 RDS-37 was the Soviet Union's first two-stage hydrogen bomb, first tested on 22 November 1955. The weapon had a nominal yield of approximately 3 megatons. It was scaled down to 1.6 megatons for the live test. Leading to the RDS-37 The RDS-3 ...
") in 1955. The Soviet Union also tested the most powerful explosive ever detonated by humans, ("
Tsar Bomba The Tsar Bomba () ( code name: ''Ivan'' or ''Vanya''), also known by the alphanumerical designation "AN602", was a thermonuclear aerial bomb, and the most powerful nuclear weapon ever created and tested. Overall, the Soviet physicist Andrei Sa ...
"), with a theoretical yield of 100 megatons, intentionally reduced to 50 when detonated. After its dissolution in 1991, the Soviet weapons entered officially into the possession of the Russian Federation. The Soviet nuclear arsenal contained some 45,000 warheads at its peak (in 1986); the Soviet Union built about 55,000 nuclear warheads since 1949.


United Kingdom

The United Kingdom tested its first nuclear weapon ("
Hurricane A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depend ...
") in 1952. The UK had provided considerable impetus and initial research for the early conception of the atomic bomb, aided by Austrian, German and Polish physicists working at British universities who had either fled or decided not to return to Nazi Germany or Nazi controlled territories. The UK collaborated closely with the United States and Canada during the Manhattan Project, but had to develop its own method for manufacturing and detonating a bomb as U.S. secrecy grew after 1945. The United Kingdom was the third country in the world, after the United States and the Soviet Union, to develop and test a nuclear weapon. Its programme was motivated to have an independent deterrent against the Soviet Union, while also maintaining its status as a
great power A great power is a sovereign state that is recognized as having the ability and expertise to exert its influence on a global scale. Great powers characteristically possess military and economic strength, as well as diplomatic and soft power inf ...
. It tested its first hydrogen bomb in 1957 (
Operation Grapple Operation Grapple was a set of four series of British nuclear weapons tests of early atomic bombs and hydrogen bombs carried out in 1957 and 1958 at Malden Island and Kiritimati (Christmas Island) in the Gilbert and Ellice Islands in the Paci ...
), making it the third country to do so after the United States and Soviet Union. The
British Armed Forces The British Armed Forces, also known as His Majesty's Armed Forces, are the military forces responsible for the defence of the United Kingdom, its Overseas Territories and the Crown Dependencies. They also promote the UK's wider interests, s ...
maintained a fleet of
V bomber The "V bombers" were the Royal Air Force (RAF) aircraft during the 1950s and 1960s that comprised the United Kingdom's strategic nuclear strike force known officially as the V force or Bomber Command Main Force. The three models of strategic ...
strategic bombers A strategic bomber is a medium- to long-range penetration bomber aircraft designed to drop large amounts of air-to-ground weaponry onto a distant target for the purposes of debilitating the enemy's capacity to wage war. Unlike tactical bombers, ...
and ballistic missile submarines (SSBNs) equipped with nuclear weapons during the Cold War. The
Royal Navy The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against F ...
currently maintains a fleet of four ballistic missile submarines equipped with Trident II missiles. In 2016, the
UK House of Commons The House of Commons is the lower house of the Parliament of the United Kingdom. Like the upper house, the House of Lords, it meets in the Palace of Westminster in London, England. The House of Commons is an elected body consisting of 650 mem ...
voted to renew the British nuclear weapons system with the , without setting a date for the commencement of service of a replacement to the current system.


France

France tested its first nuclear weapon in 1960 ("
Gerboise Bleue ''Gerboise Bleue'' (; ) was the codename of the first French nuclear test. It was conducted by the Nuclear Experiments Operational Group (GOEN), a unit of the Joint Special Weapons Command on 13 February 1960, at the Saharan Military Experimen ...
"), based mostly on its own research. It was motivated by the
Suez Crisis The Suez Crisis, or the Second Arab–Israeli war, also called the Tripartite Aggression ( ar, العدوان الثلاثي, Al-ʿUdwān aṯ-Ṯulāṯiyy) in the Arab world and the Sinai War in Israel,Also known as the Suez War or 1956 Wa ...
diplomatic tension in relation to both the Soviet Union and its allies, the United States and United Kingdom. It was also relevant to retain great power status, alongside the United Kingdom, during the post-colonial Cold War (see:
Force de frappe The ''Force de frappe'' ( French: "strike force"), or ''Force de dissuasion'' ("deterrent force") after 1961,Gunston, Bill. Bombers of the West. New York: Charles Scribner's and Sons; 1973. p104 is the designation of what used to be a triad of ...
). France tested its first hydrogen bomb in 1968 (" Opération Canopus"). After the Cold War, France has disarmed 175 warheads with the reduction and modernization of its arsenal that has now evolved to a dual system based on
submarine-launched ballistic missiles A submarine-launched ballistic missile (SLBM) is a ballistic missile capable of being launched from submarines. Modern variants usually deliver multiple independently targetable reentry vehicles (MIRVs), each of which carries a nuclear warhead ...
(SLBMs) and medium-range air-to-surface missiles (
Rafale The Dassault Rafale (, literally meaning "gust of wind", and "burst of fire" in a more military sense) is a French twin-engine, canard delta wing, multirole fighter aircraft designed and built by Dassault Aviation. Equipped with a wide ran ...
fighter-bombers). However, new nuclear weapons are in development and reformed nuclear squadrons were trained during Enduring Freedom operations in Afghanistan. France acceded to the Nuclear Non-Proliferation Treaty in 1992.Treaty on the Non-Proliferation of Nuclear Weapons
, United Nations Office for Disarmament Affairs.
In January 2006, President
Jacques Chirac Jacques René Chirac (, , ; 29 November 193226 September 2019) was a French politician who served as President of France from 1995 to 2007. Chirac was previously Prime Minister of France from 1974 to 1976 and from 1986 to 1988, as well as Ma ...
stated a terrorist act or the use of
weapons of mass destruction A weapon of mass destruction (WMD) is a chemical, biological, radiological, nuclear, or any other weapon that can kill and bring significant harm to numerous individuals or cause great damage to artificial structures (e.g., buildings), natura ...
against France would result in a nuclear counterattack. In February 2015, President
François Hollande François Gérard Georges Nicolas Hollande (; born 12 August 1954) is a French politician who served as President of France from 2012 to 2017. He previously was First Secretary of the Socialist Party (PS) from 1997 to 2008, Mayor of Tulle from ...
stressed the need for a nuclear deterrent in "a dangerous world". He also detailed the French deterrent as "fewer than 300" nuclear warheads, three sets of 16 submarine-launched ballistic missiles and 54 medium-range air-to-surface missiles and urged other states to show similar transparency.


China

China tested its first nuclear weapon device ("
596 __NOTOC__ Year 596 ( DXCVI) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 596 for this year has been used since the early medieval period, when the Anno Domini calendar era bec ...
") in 1964 at the
Lop Nur Lop Nur or Lop Nor (from a Mongolian name meaning "Lop Lake", where "Lop" is a toponym of unknown origin) is a former salt lake, now largely dried up, located in the eastern fringe of the Tarim Basin, between the Taklamakan and Kumtag deserts ...
test site. The weapon was developed as a deterrent against both the United States and the Soviet Union. Two years later, China had a fission bomb capable of being put onto a
nuclear missile Nuclear weapons delivery is the technology and systems used to place a nuclear weapon at the position of detonation, on or near its target. Several methods have been developed to carry out this task. ''Strategic'' nuclear weapons are used primari ...
. It tested its first hydrogen bomb ("
Test No. 6 Test No. 6 is the codename for China's first test of a three-staged thermonuclear device and, also its sixth nuclear weapons test. It was a part of the "Two Bombs, One Satellite" program. Development The device was detonated at Lop Nur Test ...
") in 1967, 32 months after testing its first nuclear weapon (the shortest fission-to-fusion development known in history). China is the only NPT nuclear-weapon state to give an unqualified negative
security assurance A security assurance, in the context of nuclear warfare, is an expression of a political position by a nuclear-armed nation intended to placate other non-nuclear-armed nations. There are two types of security assurance: positive and negative. A pos ...
with its "
no first use In nuclear ethics and deterrence theory, No first use (NFU) refers to a type of pledge or policy wherein a nuclear power formally refrains from the use of nuclear weapons or other weapons of mass destruction (WMDs) in warfare, except for as a seco ...
" policy. China acceded to the Nuclear Non-Proliferation Treaty in 1992. As of 2016, China fielded SLBMs onboard its
JL-2 The JL-2 (, NATO reporting name CSS-N-14) is a Chinese second-generation intercontinental-range submarine-launched ballistic missile (SLBM) deployed on the People's Liberation Army Navy's (PLAN) Type 094 submarines. It succeeds the JL-1 SLBM ...
submarines. As of May 2021, China has an estimated total inventory of 350 warheads.


States declaring possession of nuclear weapons


India

India is not a party to the
Nuclear Non-Proliferation Treaty The Treaty on the Non-Proliferation of Nuclear Weapons, commonly known as the Non-Proliferation Treaty or NPT, is an international treaty whose objective is to prevent the spread of nuclear weapons and weapons technology, to promote cooperation ...
. Indian officials rejected the NPT in the 1960s on the grounds that it created a world of nuclear "haves" and "have-nots", arguing that it unnecessarily restricted "peaceful activity" (including "peaceful nuclear explosives"), and that India would not accede to international control of their nuclear facilities unless all other countries engaged in
unilateral disarmament Unilateral disarmament is a policy option, to renounce weapons without seeking equivalent concessions from one's actual or potential rivals. It was most commonly used in the twentieth century in the context of ''unilateral nuclear disarmament'', a r ...
of their own nuclear weapons. The Indian position has also asserted that the NPT is in many ways a neo-colonial regime designed to deny security to post-colonial powers. The country tested what is called a " peaceful nuclear explosive" in 1974 (which became known as "
Smiling Buddha Operation Smiling BuddhaThis test has many code names. Civilian scientists called it "Operation Smiling Buddha" and the Indian Army referred to it as ''Operation Happy Krishna''. According to United States Military Intelligence, ''Operation H ...
"). The test was the first test developed after the creation of the NPT, and created new questions about how civilian nuclear technology could be diverted secretly to weapons purposes (
dual-use technology In politics, diplomacy and export control, dual-use items refers to goods, software and technology that can be used for both civilian and military applications.
). India's secret development caused great concern and anger particularly from nations that had supplied its nuclear reactors for peaceful and power generating needs, such as Canada. After its 1974 test, India maintained that its nuclear capability was primarily "peaceful", but between 1988 and 1990 it apparently weaponized two dozen nuclear weapons for delivery by air. In 1998 India tested weaponized nuclear warheads ("
Operation Shakti The Pokhran-II tests were a series of five nuclear bomb Nuclear weapons testing, test explosions conducted by India at the Indian Army's Pokhran#Pokhran Nuclear Test Range, Pokhran Test Range in May 1998. It was the second instance of nuclear t ...
"), including a
thermonuclear device A thermonuclear weapon, fusion weapon or hydrogen bomb (H bomb) is a second-generation nuclear weapon design. Its greater sophistication affords it vastly greater destructive power than first-generation nuclear bombs, a more compact size, a low ...
. India adopted a "
no first use In nuclear ethics and deterrence theory, No first use (NFU) refers to a type of pledge or policy wherein a nuclear power formally refrains from the use of nuclear weapons or other weapons of mass destruction (WMDs) in warfare, except for as a seco ...
" policy in 1998. In July 2005, U.S. President
George W. Bush George Walker Bush (born July 6, 1946) is an American politician who served as the 43rd president of the United States from 2001 to 2009. A member of the Republican Party, Bush family, and son of the 41st president George H. W. Bush, he ...
and Indian Prime Minister
Manmohan Singh Manmohan Singh (; born 26 September 1932) is an Indian politician, economist and statesman who served as the 13th prime minister of India from 2004 to 2014. He is also the third longest-serving prime minister after Jawaharlal Nehru and Indir ...
announced plans to conclude an Indo-US civilian nuclear agreement. This came to fruition through a series of steps that included India's announced plan to separate its civil and military nuclear programs in March 2006, the passage of the
India–United States Civil Nuclear Agreement The 123 Agreement signed between the United States of America and the Republic of India is known as the U.S.–India Civil Nuclear Agreement or Indo-US nuclear deal. The framework for this agreement was a July 18, 2005, joint statement by th ...
by the
U.S. Congress The United States Congress is the legislature of the federal government of the United States. It is Bicameralism, bicameral, composed of a lower body, the United States House of Representatives, House of Representatives, and an upper body, ...
in December 2006, the conclusion of a U.S.–India nuclear cooperation agreement in July 2007, approval by the
IAEA The International Atomic Energy Agency (IAEA) is an intergovernmental organization that seeks to promote the peaceful use of nuclear energy and to inhibit its use for any military purpose, including nuclear weapons. It was established in 1957 ...
of an India-specific safeguards agreement, agreement by the
Nuclear Suppliers Group The Nuclear Suppliers Group (NSG) is a multilateral export control regime and a group of nuclear supplier countries that seek to prevent nuclear proliferation by controlling the export of materials, equipment and technology that can be used to m ...
to a waiver of export restrictions for India, approval by the U.S. Congress and culminating in the signature of U.S.–India agreement for civil nuclear cooperation in October 2008. The
U.S. State Department The United States Department of State (DOS), or State Department, is an executive department of the U.S. federal government responsible for the country's foreign policy and relations. Equivalent to the ministry of foreign affairs of other nati ...
said it made it "very clear that we will not recognize India as a nuclear-weapon state". The United States is bound by the
Hyde Act Hyde or Hydes may refer to: People *Hyde (surname) *Hyde (musician), Japanese musician from the bands L'Arc-en-Ciel and VAMPS American statutes *Hyde Amendment, an amendment that places well-defined limitations on Medicare spending on aborti ...
with India and may cease all cooperation with India if India detonates a nuclear explosive device. The US had further said it is not its intention to assist India in the design, construction or operation of sensitive nuclear technologies through the transfer of dual-use items. In establishing an exemption for India, the Nuclear Suppliers Group reserved the right to consult on any future issues which might trouble it. As of May 2021, India was estimated to have a stockpile of around 160 warheads.


Pakistan

Pakistan is also not a party to the Nuclear Non-Proliferation Treaty. Pakistan covertly developed nuclear weapons over decades, beginning in the late 1970s. Pakistan first delved into nuclear power after the establishment of its first nuclear power plant near
Karachi Karachi (; ur, ; ; ) is the most populous city in Pakistan and 12th most populous city in the world, with a population of over 20 million. It is situated at the southern tip of the country along the Arabian Sea coast. It is the former cap ...
with equipment and materials supplied mainly by western nations in the early 1970s. Pakistani Prime Minister
Zulfiqar Ali Bhutto Zulfikar (or Zulfiqar) Ali Bhutto ( ur, , sd, ذوالفقار علي ڀٽو; 5 January 1928 – 4 April 1979), also known as Quaid-e-Awam ("the People's Leader"), was a Pakistani barrister, politician and Politician, statesman who served as ...
promised in 1971 that if India could build nuclear weapons then Pakistan would too, according to him: "We will develop Nuclear stockpiles, even if we have to eat grass." It is believed that Pakistan has possessed nuclear weapons since the mid-1980s. The United States continued to certify that Pakistan did not possess such weapons until 1990, when sanctions were imposed under the
Pressler Amendment Pressler (or Preßler) () is a German surname. Notable people with the surname include: * Johann Valentin Pressler - German ancestor of Elvis Presley who changed his name to Presley during the American Civil War * Kimberly Pressler (born 1977), Am ...
, requiring a cutoff of U.S. economic and military assistance to Pakistan. In 1998, Pakistan conducted its first six nuclear tests at the
Ras Koh Hills The Ras Koh Hills is a range of granite hills forming a southwestern part of the Sulaiman Mountain Range, in the Chagai and Kharan districts of Pakistan's Balochistan province. The word "Ras" means "gateway" and the word "Koh" means "mountai ...
in response to the five tests conducted by India a few weeks before. In 2004, the Pakistani metallurgist
Abdul Qadeer Khan Abdul Qadeer Khan, (; ur, ; 1 April 1936 – 10 October 2021), known as A. Q. Khan, was a Pakistani nuclear physicist and metallurgical engineer. He was a key figure in Pakistan’s nuclear weapons program and is colloquially known as the ...
, a key figure in Pakistan's nuclear weapons program, confessed to heading an international
black market A black market, underground economy, or shadow economy is a clandestine market or series of transactions that has some aspect of illegality or is characterized by noncompliance with an institutional set of rules. If the rule defines the se ...
ring involved in selling nuclear weapons technology. In particular, Khan had been selling
gas centrifuge A gas centrifuge is a device that performs isotope separation of gases. A centrifuge relies on the principles of centrifugal force accelerating molecules so that particles of different masses are physically separated in a gradient along the radiu ...
technology to North Korea, Iran, and Libya. Khan denied complicity by the Pakistani government or Army, but this has been called into question by journalists and IAEA officials, and was later contradicted by statements from Khan himself. As of early 2013, Pakistan was estimated to have had a stockpile of around 140 warheads, and in November 2014 it was projected that by 2020 Pakistan would have enough fissile material for 200 warheads.


North Korea

North Korea was a party to the Nuclear Non-Proliferation Treaty, but announced a withdrawal on 10 January 2003, after the United States accused it of having a secret
uranium enrichment Enriched uranium is a type of uranium in which the percent composition of uranium-235 (written 235U) has been increased through the process of isotope separation. Naturally occurring uranium is composed of three major isotopes: uranium-238 (238U ...
program and cut off energy assistance under the 1994
Agreed Framework The Agreed Framework between the United States of America and the Democratic People's Republic of Korea (북미제네바기본합의서) was signed on 21 October 1994, between North Korea (DPRK) and the United States. The objective of the agreeme ...
. In February 2005, North Korea claimed to possess functional nuclear weapons, though their lack of a test at the time led many experts to doubt the claim. In October 2006, North Korea stated that, in response to growing intimidation by the United States, it would conduct a nuclear test to confirm its nuclear status. North Korea reported a successful nuclear test on 9 October 2006 (see
2006 North Korean nuclear test The 2006 North Korean nuclear test was the detonation of a nuclear device conducted by North Korea on October 9, 2006. On October 3, 2006, North Korea announced its intention to conduct a nuclear test. The blast is generally estimated to have h ...
). Most U.S. intelligence officials believed that the test was probably only partially successful with a yield of less than a kiloton. North Korea conducted a second, higher-yield test on 25 May 2009 (see
2009 North Korean nuclear test The 2009 North Korean nuclear test was the underground detonation of a nuclear device conducted on Monday, 25 May 2009 by the Democratic People's Republic of Korea.
) and a third test with still-higher yield on 12 February 2013 (see
2013 North Korean nuclear test On 12 February 2013, North Korean state media announced it had conducted an underground nuclear test, its third in seven years. A tremor that exhibited a nuclear bomb signature with an initial magnitude 4.9 (later revised to 5.1) was detected b ...
). North Korea claimed to have conducted its first hydrogen-bomb test on 5 January 2016, though measurements of seismic disturbances indicate that the detonation was not consistent with a hydrogen bomb. On 3 September 2017, North Korea detonated a device, which caused a magnitude 6.1 tremor, consistent with a low-powered
thermonuclear Thermonuclear fusion is the process of atomic nuclei combining or “fusing” using high temperatures to drive them close enough together for this to become possible. There are two forms of thermonuclear fusion: ''uncontrolled'', in which the re ...
detonation; NORSAR estimates the yield at 250 kilotons of TNT. In 2018, North Korea announced a halt in nuclear weapons tests and made a conditional commitment to denuclearisation of the
Korean Peninsula Korea ( ko, 한국, or , ) is a peninsular region in East Asia. Since 1945, it has been divided at or near the 38th parallel, with North Korea (Democratic People's Republic of Korea) comprising its northern half and South Korea (Republic o ...
; however, in December 2019, it indicated it no longer considered itself bound by the moratorium.
Kim Jong-un Kim Jong-un (; , ; born 8 January 1982) is a North Korean politician who has been Supreme Leader of North Korea since 2011 and the leader of the Workers' Party of Korea (WPK) since 2012. He is a son of Kim Jong-il, who was North Korea's sec ...
officially declared North Korea a nuclear weapons state during a speech on 9 September 2022, the country's foundation day.


States indicated to possess nuclear weapons


Israel

Israel is widely believed to have been the sixth country in the world to develop nuclear weapons, but it has not acknowledged its nuclear forces. It had "rudimentary, but deliverable," nuclear weapons available as early as 1966.''My Promised Land'', by
Ari Shavit Ari Shavit (; born 16 November 1957) is an Israeli reporter and writer. Shavit was a senior correspondent at the left-of-center Israeli newspaper '' Haaretz'' before he resigned when a pattern of sexual misconduct came to public attention. A s ...
, (London 2014), page 188
NTI Israel Profile
Retrieved 12 July 2007.
Israel is not a party to the NPT. Israel engages in
strategic ambiguity A policy of deliberate ambiguity (also known as a policy of strategic ambiguity, ''strategic uncertainty'') is the practice by a government of being intentionally ambiguous on certain aspects of its foreign policy. It may be useful if the country ...
, saying it would not be the first country to "introduce" nuclear weapons into the region, but refusing to otherwise confirm or deny a nuclear weapons program or arsenal. This policy of "nuclear opacity" has been interpreted as an attempt to get the benefits of
deterrence Deterrence may refer to: * Deterrence theory, a theory of war, especially regarding nuclear weapons * Deterrence (penology), a theory of justice * Deterrence (psychology), a psychological theory * ''Deterrence'' (film), a 1999 drama starring Kev ...
with a minimal political cost. Due to a US ban on funding countries that have
weapons of mass destruction A weapon of mass destruction (WMD) is a chemical, biological, radiological, nuclear, or any other weapon that can kill and bring significant harm to numerous individuals or cause great damage to artificial structures (e.g., buildings), natura ...
, Israel would lose around $2 billion a year in military and other aid from the US if it admitted to possessing nuclear weapons. According to the
Natural Resources Defense Council The Natural Resources Defense Council (NRDC) is a United States-based 501(c)(3) non-profit international environmental advocacy group, with its headquarters in New York City and offices in Washington D.C., San Francisco, Los Angeles, Chicago, Bo ...
and the
Federation of American Scientists The Federation of American Scientists (FAS) is an American nonprofit global policy think tank with the stated intent of using science and scientific analysis to attempt to make the world more secure. FAS was founded in 1946 by scientists who wo ...
, Israel likely possesses around 80–400 nuclear weapons.There are a wide range of estimates as to the size of the Israeli nuclear arsenal. For a compiled list of estimates, see
Avner Cohen Avner Cohen (born 1951) is an Israeli writer, historian, and professor. He is well known for his works on Israel's nuclear history and strategic policy. He is currently a professor at the Middlebury Institute of International Studies, and the Di ...
, ''The Worst-Kept Secret: Israel's bargain with the Bomb'' (Columbia University Press, 2010), Table 1, page xxvii and page 82.
The
Stockholm International Peace Research Institute Stockholm International Peace Research Institute (SIPRI) is an international institute based in Stockholm. It was founded in 1966 and provides data, analysis and recommendations for armed conflict, military expenditure and arms trade as well a ...
estimates that Israel has approximately 80 intact nuclear weapons, of which 50 are for delivery by
Jericho II Jericho is a general designation given to a loosely-related family of deployed ballistic missiles developed by Israel starting in the 1960s. The name is taken from the first development contract for the Jericho I signed between Israel and Dassault ...
medium-range ballistic missiles and 30 are
gravity bombs An unguided bomb, also known as a free-fall bomb, gravity bomb, dumb bomb, or iron bomb, is a conventional or nuclear aircraft-delivered bomb that does not contain a guidance system and hence simply follows a ballistic trajectory. This described ...
for delivery by aircraft.
SIPRI Sipri may refer to: *As-Safira, a city in Syria, known in pre-Islamic times as Sipri *Shivpuri, a city and a municipality in Madhya Pradesh, India, formerly known as Sipri *Stockholm International Peace Research Institute Stockholm Internatio ...
also reports that there was renewed speculation in 2012 that Israel may also have developed nuclear-capable
submarine-launched cruise missiles A submarine-launched cruise missile (SLCM) is a cruise missile that is launched from a submarine (especially a SSG or SSGN). Current versions are typically standoff weapons known as land-attack cruise missiles (LACMs), which are used to attack p ...
.


Launch authority

The decision to use nuclear weapons is always restricted to a single person or small group of people. The
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
and
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
require their respective presidents to approve the use of nuclear weapons. In the US, the Presidential Emergency Satchel is always handled by a nearby aide unless the
President President most commonly refers to: *President (corporate title) *President (education), a leader of a college or university *President (government title) President may also refer to: Automobiles * Nissan President, a 1966–2010 Japanese ful ...
is near a command center. The decision rests with the
Monarch A monarch is a head of stateWebster's II New College DictionarMonarch Houghton Mifflin. Boston. 2001. p. 707. Life tenure, for life or until abdication, and therefore the head of state of a monarchy. A monarch may exercise the highest authority ...
and the
Prime Minister A prime minister, premier or chief of cabinet is the head of the cabinet and the leader of the ministers in the executive branch of government, often in a parliamentary or semi-presidential system. Under those systems, a prime minister is not ...
in the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North ...
. Information from
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
is unclear, but "the launch of nuclear weapons is commonly believed to rest with the Central Military Commission of the
Chinese Communist Party The Chinese Communist Party (CCP), officially the Communist Party of China (CPC), is the founding and One-party state, sole ruling party of the China, People's Republic of China (PRC). Under the leadership of Mao Zedong, the CCP emerged victoriou ...
."
Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...
grants such power to the
President President most commonly refers to: *President (corporate title) *President (education), a leader of a college or university *President (government title) President may also refer to: Automobiles * Nissan President, a 1966–2010 Japanese ful ...
but may also require approval from the
Minister of Defence A defence minister or minister of defence is a Cabinet (government), cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from coun ...
and the
Chief of the General Staff The Chief of the General Staff (CGS) is a post in many armed forces (militaries), the head of the military staff. List * Chairman of the Joint Chiefs of Staff (United States) * Chief of the General Staff (Abkhazia) * Chief of General Staff (Afg ...
; weapons can also be launched using the automated
Dead Hand Dead Hand (russian: Система «Периметр», , lit. "Perimeter" System, with the GRAU Index 15E601, Cyrillic: 15Э601), also known as Perimeter, is a Cold War-era automatic nuclear weapons-control system (similar in concept to the A ...
system. The Supreme Commander of the Armed Forces has authority in
North Korea North Korea, officially the Democratic People's Republic of Korea (DPRK), is a country in East Asia. It constitutes the northern half of the Korea, Korean Peninsula and shares borders with China and Russia to the north, at the Yalu River, Y ...
. India, Pakistan and Israel have committees for such a decision.Union of Concerned Scientists https://www.ucsusa.org/sites/default/files/attach/2017/11/Launch-Authority.pdf Accessed 21 February 2021


Nuclear weapons sharing

Under
NATO The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two No ...
nuclear weapons sharing Nuclear sharing is a concept in NATO's policy of nuclear deterrence, which allows member countries without nuclear weapons of their own to participate in the planning for the use of nuclear weapons by NATO. In particular, it provides for the arm ...
, the United States has provided nuclear weapons for Belgium, Germany, Italy, the Netherlands, and Turkey to deploy and store. This involves pilots and other staff of the "non-nuclear" NATO states practicing, handling, and delivering the U.S. nuclear bombs, and adapting non-U.S. warplanes to deliver U.S. nuclear bombs. However, since all U.S. nuclear weapons are protected with
Permissive Action Link A permissive action link (PAL) is an access control security device for nuclear weapons. Its purpose is to prevent unauthorized arming or detonation of a nuclear weapon. The United States Department of Defense definition is: The earliest PALs ...
s, the host states cannot easily arm the bombs without authorization codes from the
U.S. Department of Defense The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national secur ...
. Former Italian President
Francesco Cossiga Francesco Maurizio Cossiga (; sc, Frantziscu Maurìtziu Còssiga, ; 1928 – 2010)
.
was an Italian pol ...
acknowledged the presence of U.S. nuclear weapons in Italy. U.S. nuclear weapons were also deployed in
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
as well as
Greece Greece,, or , romanized: ', officially the Hellenic Republic, is a country in Southeast Europe. It is situated on the southern tip of the Balkans, and is located at the crossroads of Europe, Asia, and Africa. Greece shares land borders with ...
from 1963 to 1984. However, Canada withdrew three of the four nuclear-capable weapons systems by 1972. The single system retained, the
AIR-2 Genie The Douglas AIR-2 Genie (previous designation MB-1) was an unguided air-to-air rocket with a 1.5 kt W25 nuclear warhead. It was deployed by the United States Air Force (USAF 1957–1985) and Canada (Royal Canadian Air Force 1965–68, Air Com ...
, had a yield of 1.5 kilotons, was designed to strike enemy aircraft as opposed to ground targets, and might not have qualified as a weapon of mass destruction given its limited yield. Members of the
Non-Aligned Movement The Non-Aligned Movement (NAM) is a forum of 120 countries that are not formally aligned with or against any major power bloc. After the United Nations, it is the largest grouping of states worldwide. The movement originated in the aftermath o ...
have called on all countries to "refrain from nuclear sharing for military purposes under any kind of security arrangements." The Institute of Strategic Studies Islamabad (ISSI) has criticized the arrangement for allegedly violating Articles I and II of the NPT, arguing that "these Articles do not permit the NWS to delegate the control of their nuclear weapons directly or indirectly to others." NATO has argued that the weapons' sharing is compliant with the NPT because "the U.S. nuclear weapons based in Europe are in the sole possession and under constant and complete custody and control of the United States." As of April 2019, the United States maintained around 150 nuclear weapons in Europe, as reflected in the accompanying table.


States formerly possessing nuclear weapons

Nuclear weapons have been present in many nations, often as staging grounds under control of other powers. However, in only one instance has a nation given up nuclear weapons after being in full control of them. The
fall of the Soviet Union The dissolution of the Soviet Union, also negatively connoted as rus, Разва́л Сове́тского Сою́за, r=Razvál Sovétskogo Soyúza, ''Ruining of the Soviet Union''. was the process of internal disintegration within the Sov ...
left several
former Soviet republics The post-Soviet states, also known as the former Soviet Union (FSU), the former Soviet Republics and in Russia as the near abroad (russian: links=no, ближнее зарубежье, blizhneye zarubezhye), are the 15 sovereign states that wer ...
in physical possession of nuclear weapons, though not operational control which was dependent on Russian-controlled electronic
Permissive Action Link A permissive action link (PAL) is an access control security device for nuclear weapons. Its purpose is to prevent unauthorized arming or detonation of a nuclear weapon. The United States Department of Defense definition is: The earliest PALs ...
s and the Russian command and control system.


South Africa

South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
produced six nuclear weapons in the 1980s, but dismantled them in the early 1990s. In 1979, there was a detection of a putative covert nuclear test in the
Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or ~19.8% of the water on Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by th ...
, called the
Vela incident The Vela incident was an unidentified double flash of light detected by an American Vela Hotel satellite on 22 September 1979 near the South African territory of Prince Edward Islands in the Indian Ocean, roughly midway between Africa and Antar ...
. It has long been speculated that it was a test by Israel, in collaboration with and with the support of South Africa, though this has never been confirmed. South Africa could not have constructed such a nuclear bomb until November 1979, two months after the "double flash" incident. South Africa acceded to the Nuclear Non-Proliferation Treaty in 1991.


Former Soviet republics

*
Belarus Belarus,, , ; alternatively and formerly known as Byelorussia (from Russian ). officially the Republic of Belarus,; rus, Республика Беларусь, Respublika Belarus. is a landlocked country in Eastern Europe. It is bordered by R ...
had 81 single warhead missiles stationed on its territory after the Soviet Union collapsed in 1991. They were all transferred to Russia by 1996. In May 1992, Belarus acceded to the Nuclear Non-Proliferation Treaty (NPT). On 28 February 2022, Belarus held a
constitutional referendum A referendum (plural: referendums or less commonly referenda) is a direct vote by the electorate on a proposal, law, or political issue. This is in contrast to an issue being voted on by a representative. This may result in the adoption of a ...
, in which it dropped its "Non-nuclear" status, in light of
Belarusian involvement in the 2022 Russian invasion of Ukraine Belarus, a close ally of Russia, has supported its eastern neighbour in the 2022 Russian invasion of Ukraine. Before the start of the offensive, Belarus allowed the Russian Armed Forces to perform weeks-long military drills on its territory; ...
. In October 2022 Russia announced plans to transfer dual-capable Iskander-M missile systems, although with conventional warheads, and giving Belorussian
Su-25 The Sukhoi Su-25 ''Grach'' (russian: Грач (''rook''); NATO reporting name: Frogfoot) is a subsonic, single-seat, twin-engine jet aircraft developed in the Soviet Union by Sukhoi. It was designed to provide close air support for Soviet Gro ...
s the "technical ability to carry nuclear weapons." *
Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia to the north and west, China to the east, Kyrgyzstan to the southeast, Uzbeki ...
had 1,400 Soviet-era nuclear weapons on its territory and transferred them all to Russia by 1995, after Kazakhstan acceded to the NPT. *
Ukraine Ukraine ( uk, Україна, Ukraïna, ) is a country in Eastern Europe. It is the second-largest European country after Russia, which it borders to the east and northeast. Ukraine covers approximately . Prior to the ongoing Russian inv ...
had "as many as 3,000" nuclear weapons deployed on its territory when it became independent from the Soviet Union in 1991, equivalent to the third-largest nuclear arsenal in the world. At the time Ukraine acceded to the NPT in December 1994, Ukraine had agreed to dispose of all nuclear weapons within its territory. The warheads were removed from Ukraine by 1996 and disassembled in Russia. Despite Russia's subsequent and internationally disputed annexation of Crimea in 2014, Ukraine reaffirmed its 1994 decision to accede to the Nuclear Non-Proliferation Treaty as a non-nuclear-weapon state. In connection with their accession to the NPT, all three countries received assurances that their sovereignty, independence, and territorial integrity would be respected, as stated in the
Budapest Memorandum on Security Assurances The Budapest Memorandum on Security Assurances comprises three substantially identical political agreements signed at the OSCE conference in Budapest, Hungary, on 5 December 1994, to provide security assurances by its signatories relating to the ...
. This agreement has been violated by Russia since the
Russo-Ukrainian War The Russo-Ukrainian War; uk, російсько-українська війна, rosiisko-ukrainska viina. has been ongoing between Russia (alongside Russian separatist forces in Donbas, Russian separatists in Ukraine) and Ukraine since Feb ...
began in 2014, during which Russia annexed Crimea, occupied Eastern Ukraine, and in 2022, invaded the remainder of the country with no direct response.


Stationed countries

Up until the 1990s the U.S. had stationed nuclear weapons outside of its territories and sharing countries.


South Korea


Taiwan

Taiwan was developing capacities to construct nuclear weapons up until the 1970s. During that time the United States stationed some of their arsenal in Taiwan.


Japan

After World War II the U.S. had nuclear weapons stationed in Japan until the 1970s.


See also

*
Comprehensive Nuclear-Test-Ban Treaty The Comprehensive Nuclear-Test-Ban Treaty (CTBT) is a multilateral treaty to ban nuclear weapons test explosions and any other nuclear explosions, for both civilian and military purposes, in all environments. It was adopted by the United Nations ...
*
Doomsday Clock The Doomsday Clock is a symbol that represents the likelihood of a man-made global catastrophe, in the opinion of the members of the ''Bulletin of the Atomic Scientists''. Maintained since 1947, the clock is a metaphor for threats to humanity ...
*
Historical nuclear weapons stockpiles and nuclear tests by country This article shows various estimates of the nuclear weapon stockpiles of various countries at various points in time. This article also shows the number of nuclear weapons tests conducted by each country at various points in time. Nuclear weapo ...
*
International Campaign to Abolish Nuclear Weapons The International Campaign to Abolish Nuclear Weapons (abbreviated to ICAN, pronounced ) is a global civil society coalition working to promote adherence to and full implementation of the Treaty on the Prohibition of Nuclear Weapons. The campa ...
*
No first use In nuclear ethics and deterrence theory, No first use (NFU) refers to a type of pledge or policy wherein a nuclear power formally refrains from the use of nuclear weapons or other weapons of mass destruction (WMDs) in warfare, except for as a seco ...
*
Nuclear disarmament Nuclear may refer to: Physics Relating to the Atomic nucleus, nucleus of the atom: *Nuclear engineering *Nuclear physics *Nuclear power *Nuclear reactor *Nuclear weapon *Nuclear medicine *Radiation therapy *Nuclear warfare Mathematics *Nuclear ...
*
Nuclear latency Nuclear latency or a nuclear threshold state is the condition of a country possessing the technology to quickly build nuclear weapons, without having actually yet done so. Because such latent capability is not proscribed by the Nuclear Non-Prolifer ...
*
Nuclear power Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced b ...
*
Nuclear proliferation Nuclear proliferation is the spread of nuclear weapons, fissionable material, and weapons-applicable nuclear technology and information to nations not recognized as " Nuclear Weapon States" by the Treaty on the Non-Proliferation of Nuclear Wea ...
*
Nuclear terrorism Nuclear terrorism refers to any person or persons detonating a nuclear weapon as an act of terrorism (i.e., illegal or immoral use of violence for a political or religious cause). Some definitions of nuclear terrorism include the sabotage of a ...
*
Nuclear warfare Nuclear warfare, also known as atomic warfare, is a theoretical military conflict or prepared political strategy that deploys nuclear weaponry. Nuclear weapons are weapons of mass destruction; in contrast to conventional warfare, nuclear ...
*
Nuclear-weapon-free zone A nuclear-weapon-free zone (NWFZ) is defined by the United Nations as an agreement that a group of states has freely established by treaty or convention that bans the development, manufacturing, control, possession, testing, stationing or transpo ...


Notes


References


Bibliography

* * .
Philipp C. Bleek, “When Did (and Didn’t) States Proliferate? Chronicling the Spread of Nuclear Weapons,” Discussion Paper (Cambridge, MA: Project on Managing the Atom, Belfer Center for Science and International Affairs, June 2017).


External links




The Nuclear Weapon Archive

Nuclear Notebook
from
Bulletin of the Atomic Scientists The ''Bulletin of the Atomic Scientists'' is a nonprofit organization concerning science and global security issues resulting from accelerating technological advances that have negative consequences for humanity. The ''Bulletin'' publishes conte ...

U.S. Nuclear Weapons in Europe: A review of post-Cold War policy, force levels, and war planning
NRDC, February 2005
Tracking Nuclear Proliferation
Online NewsHour with Jim Lehrer *
Stockholm International Peace Research Institute Stockholm International Peace Research Institute (SIPRI) is an international institute based in Stockholm. It was founded in 1966 and provides data, analysis and recommendations for armed conflict, military expenditure and arms trade as well a ...
's data on world nuclear forces
Nuclear Proliferation International History Project
For more on the history of nuclear proliferation see the Woodrow Wilson Center's Nuclear Proliferation International History Project website.
Proliferation Watch: US Intelligence Assessments of Potential Nuclear Powers, 1977–2001
{{DEFAULTSORT:States With Nuclear Weapons * Cold War
Nuclear weapons A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions (thermonuclear bomb), producing a nuclear explosion. Both bomb ...
Nuclear weapons policy Nuclear proliferation Nuclear technology-related lists