The London Protocol was signed on 21 March 1877 between Russia and the United Kingdom. The Russians agreed not to establish any
client states
A client state, in international relations, is a state that is economically, politically, and/or militarily subordinate to another more powerful state (called the "controlling state"). A client state may variously be described as satellite state, ...
in case they attained victory in the looming
Russo-Turkish War
The Russo-Turkish wars (or Ottoman–Russian wars) were a series of twelve wars fought between the Russian Empire and the Ottoman Empire between the 16th and 20th centuries. It was one of the longest series of military conflicts in European histo ...
. In return, the British agreed to remain neutral in any conflict between the
Ottoman Empire
The Ottoman Empire, * ; is an archaic version. The definite article forms and were synonymous * and el, Оθωμανική Αυτοκρατορία, Othōmanikē Avtokratoria, label=none * info page on book at Martin Luther University) ...
and Russia. The agreement was an effort to maintain a balance of power in the
Balkans
The Balkans ( ), also known as the Balkan Peninsula, is a geographical area in southeastern Europe with various geographical and historical definitions. The region takes its name from the Balkan Mountains that stretch throughout the who ...
and to avoid intervention by the other
Great Powers
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 in ...
. Russian attempts to create a large
Bulgaria
Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedon ...
in the
Treaty of San Stefano
The 1878 Treaty of San Stefano (russian: Сан-Стефанский мир; Peace of San-Stefano, ; Peace treaty of San-Stefano, or ) was a treaty between the Russian and Ottoman empires at the conclusion of the Russo-Turkish War of 1877-18 ...
led to the British withdrawal from the Protocol and threatened military intervention, quieted only by the
Congress of Berlin
The Congress of Berlin (13 June – 13 July 1878) was a diplomatic conference to reorganise the states in the Balkan Peninsula after the Russo-Turkish War of 1877–78, which had been won by Russia against the Ottoman Empire. Represented at th ...
.
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1877 treaties