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The Soviet invasion of Poland was a military operation by the Soviet Union without a formal declaration of war. On 17 September 1939, the Soviet Union invaded Poland from the east, sixteen days after Germany invaded Poland from the west. Subsequent military operations lasted for the following 20 days and ended on 6 October 1939 with the two-way division and annexation of the entire territory of the Second Polish Republic by Nazi Germany and the Soviet Union. This division is sometimes called the Fourth Partition of Poland. The Soviet (as well as German) invasion of Poland was indirectly indicated in the "secret protocol" of the Molotov–Ribbentrop Pact signed on 23 August 1939, which divided Poland into "spheres of influence" of the two powers and questioned the future existence of the Polish state. German and Soviet cooperation in the invasion of Poland has been described as co-belligerence. The Red Army, which vastly outnumbered the Polish defenders, achieved its targets encountering only limited resistance. Some 320,000 Polish prisoners of war had been captured. The campaign of mass persecution in the newly acquired areas began immediately. In November 1939 the Soviet government annexed the entire Polish territory under its control. Some 13.5 million Polish citizens who fell under the military occupation were made into new Soviet subjects following show elections conducted by the NKVD secret police in the atmosphere of terror, the results of which were used to legitimize the use of force. A Soviet campaign of political murders and other forms of repression, targeting Polish figures of authority such as military officers, police and priests, began with a wave of arrests and summary executions. The Soviet NKVD sent hundreds of thousands of people from eastern Poland to Siberia and other remote parts of the Soviet Union in four major waves of deportation between 1939 and 1941. Soviet forces occupied eastern Poland until the summer of 1941, when they were driven out by the German army in the course of Operation Barbarossa. The area was under German occupation until the Red Army reconquered it in the summer of 1944. An agreement at the Yalta Conference permitted the Soviet Union to annex almost all of their Molotov–Ribbentrop Pact portion of the Second Polish Republic, compensating the Polish People's Republic with the greater southern part of East Prussia and territories east of the Oder–Neisse line. The Soviet Union appended the annexed territories to the Ukrainian Soviet Socialist Republic, the Byelorussian Soviet Socialist Republic and the Lithuanian Soviet Socialist Republic. After the end of World War II in Europe, the Soviet Union signed a Polish–Soviet border agreement with the new, internationally recognized Polish Provisional Government of National Unity on 16 August 1945. This agreement recognized the status quo as the new official border between the two countries with the exception of the region around Białystok and a minor part of Galicia east of the San River around Przemyśl, which were later returned to Poland.

Prelude

In early 1939, several months before the invasion, the Soviet Union began strategic alliance negotiations with the United Kingdom and France against the crash militarization of Nazi Germany under Adolf Hitler. In August 1939 the USSR made an offer to the United Kingdom and France to send "120 infantry divisions (each with some 19,000 troops), 16 cavalry divisions, 5,000 heavy artillery pieces, 9,500 tanks and up to 5,500 fighter aircraft and bombers on Germany's borders". Since the USSR shared no border with Germany, this would effectively mean an overwhelming, voluntary occupation of the territories of Poland by the Red Army, which was previously the site of the Polish–Soviet War in 1920. The negotiations failed. As the terms were rejected, Joseph Stalin pursued the Molotov–Ribbentrop Pact with Adolf Hitler, which was signed on 23 August 1939. This non-aggression pact contained a secret protocol, that drew up the division of Northern and Eastern Europe into German and Soviet spheres of influence in the event of war. One week after the signing of the Molotov–Ribbentrop Pact, German forces invaded Poland from the west, north, and south on 1 September 1939. Polish forces gradually withdrew to the southeast where they prepared for a long defense of the Romanian Bridgehead and awaited the French and British support and relief that they were expecting, but neither the French nor the British came to their rescue. On 17 September 1939 the Soviet Red Army invaded the Kresy regions in accordance with the secret protocol. At the opening of hostilities several Polish cities including Dubno, Łuck and Włodzimierz Wołyński let the Red Army in peacefully, convinced that it was marching on in order to fight the Germans. General Juliusz Rómmel of the Polish Army issued an unauthorised order to treat them like an ally before it was too late. The Soviet government announced it was acting to protect the Ukrainians and Belarusians who lived in the eastern part of Poland, because the Polish state – according to Soviet propaganda – had collapsed in the face of the Nazi German attack and could no longer guarantee the security of its own citizens. Facing a second front, the Polish government concluded that the defense of the Romanian Bridgehead was no longer feasible and ordered an emergency evacuation of all uniformed troops to then-neutral Romania.

Poland between the two world wars

The League of Nations and the peace treaties of the 1919 Paris Peace Conference did not, as it had been hoped, help to promote ideas of reconciliation along European ethnic lines. Epidemic nationalism, fierce political resentment in Central Europe (Germany, Austria, Hungary) where 100% of the population had ''in absentia'' been declared universally guilty, and post-colonial chauvinism (Italy) led to frenzied revanchism and territorial ambitions. Józef Piłsudski sought to expand the Polish borders as far east as possible in an attempt to create a Polish-led federation, capable of countering future imperialist action on the part of Russia or Germany. By 1920 the Bolsheviks had emerged victorious from the Russian Civil War and, de facto acquired exclusive control over the government and the regional administration. After all foreign interventions had been repelled, the Red Army, commanded by Trotsky and Stalin (among others) started to advance westward towards the disputed territories intending to encourage Communist movements in Western Europe. The border skirmishes of 1919 progressively escalated and eventually culminated in the Polish–Soviet War in 1920. Following the Polish victory upon the Battle of Warsaw, the Soviets sued for peace and the war ended with an armistice in October 1920. The parties signed a formal peace treaty, the Peace of Riga, on 18 March 1921, dividing the disputed territories between Poland and Soviet Russia. In an action that largely determined the Soviet-Polish border during the interwar period, the Soviets offered the Polish peace delegation territorial concessions in the contested borderland areas, that closely resembled the border between the Russian Empire and the Polish–Lithuanian Commonwealth before the first partition of 1772. In the aftermath of the peace agreement, the Soviet leaders steadily abandoned the idea of international Communist revolution and did not return to the concept for approximately 20 years. The Conference of Ambassadors and the international community (with the exception of Lithuania) recognized Poland's eastern frontiers in 1923.

Treaty negotiations

German troops occupied Prague on 15 March 1939. In mid-April, the Soviet Union, Britain and France began trading diplomatic suggestions regarding a political and military agreement to counter potential further German aggression. Poland did not participate in these talks. The tripartite discussions focused on possible guarantees to participating countries should German expansionism continue. The Soviets did not trust the British or the French to honour a collective security agreement, because they had refused to react against the Nationalists during the Spanish Civil War and let the occupation of Czechoslovakia happen without effective opposition. The Soviet Union also suspected that Britain and France would seek to remain on the sidelines during any potential Nazi-Soviet conflict. Stalin, however, had through his emissaries, been conducting secret talks with Nazi Germany as early as 1936 and according to Robert C. Grogin (author of ''Natural Enemies''), a mutual understanding with Hitler had always been his preferred diplomatic solution. The Soviet leader sought nothing short of an ironclad guarantee against losing his sphere of influence, and aspired to create a north-south buffer zone from Finland to Romania, conveniently established in the event of an attack. The Soviets demanded the right to enter these countries in case of a security threat. Talks on military matters, that had begun in mid-August, quickly stalled over the topic of Soviet troop passage through Poland in the event of a German attack. British and French officials pressured the Polish government to agree to the Soviet terms. However, Polish officials bluntly refused to allow Soviet troops to enter Polish territory upon expressing grave concerns that once Red Army troops had set foot on Polish soil, they might decline demands to leave. Thereupon Soviet officials suggested that Poland's objections be ignored and that the tripartite agreements be concluded. The British refused the proposal, fearing that such a move would encourage Poland to establish stronger bilateral relations with Germany. German officials had secretly been forwarding hints towards Soviet channels for months already, alluding that more favourable terms in a political agreement would be offered than Britain and France. The Soviet Union had meanwhile started discussions with Nazi Germany regarding the establishment of an economic agreement while concurrently negotiating with those of the tripartite group. By late July and early August 1939, Soviet and German diplomats had reached a near-complete consensus on the details for a planned economic agreement and addressed the potential for a desirable political accord. On 19 August 1939, German and Soviet officials concluded the 1939 German–Soviet Commercial Agreement, a mutually beneficial economic treaty that envisaged the trade and exchange of Soviet raw materials for German weapons, military technology and civilian machinery. Two days later, the Soviet Union suspended the tripartite military talks. On 24 August, the Soviet Union and Germany signed the political and military arrangements following the trade agreement, in the Molotov–Ribbentrop Pact. This pact included terms of mutual non-aggression and contained secret protocols, that regulated detailed plans for the division of the states of northern and eastern Europe into German and Soviet spheres of influence. The Soviet sphere initially included Latvia, Estonia and Finland. Germany and the Soviet Union would partition Poland. The territories east of the Pisa, Narev, Vistula, and San rivers would fall to the Soviet Union. The pact also provided designs for the Soviet participation in the invasion, that included the opportunity to regain territories ceded to Poland in the Peace of Riga of 1921. The Soviet planners would enlarge the Ukrainian and Belarusian republics to subjugate the entire eastern half of Poland without the threat of disagreement with Adolf Hitler. One day after the German-Soviet pact had been signed, French and British military delegations urgently requested a meeting with Soviet military negotiator Kliment Voroshilov. On 25 August Voroshilov acknowledged, that ''"in view of the changed political situation, no useful purpose can be served in continuing the conversation."'' On the same day, however, Britain and Poland signed the British-Polish Pact of Mutual Assistance,Osmańczyk-Mango p. 231 which adjudicated, that Britain commit itself to defend and preserve Poland's sovereignty and independence.

German invasion of Poland and Soviet preparations

Hitler tried to dissuade Britain and France from interfering in the upcoming conflict and on 26 August 1939 proposed to make ''Wehrmacht'' forces available to Britain in the future. At midnight of 29 August, German Foreign Minister Joachim von Ribbentrop handed British Ambassador Nevile Henderson a list of terms that would allegedly ensure peace with regards to Poland. Under the terms, Poland was to hand over Danzig (Gdańsk) to Germany and within a year there was a plebiscite (referendum) to be held in the Polish Corridor, based on residency and demography of the year 1919. When the Polish Ambassador Lipski, who met Ribbentrop on 30 August, declared that he did not have the authority to approve of these demands on his own, Ribbentrop dismissed him and his foreign office announced that Poland had rejected the German offer and further negotiations with Poland were abandoned. On 31 August, in a false flag operation German units, posing as regular Polish troops, staged the Gleiwitz incident near the border town of Gleiwitz in Silesia. On the following day (1 September) Hitler announced, that official military actions against Poland had commenced at 4:45 a.m. German air forces bombarded the cities Lwow and Łuck. Polish security service personnel carried out arrests among Ukrainian intelligentsia in Lwow and Przemysl. On 1 September 1939 at 11:00 a.m. Moscow time, the counselor of the German embassy in Moscow, Gustav Hilger arrived at the People's Commissariat of Foreign Affairs and formally annunciated the beginning of the German–Polish War, the annexation of Danzig (Gdańsk) as he conveyed a request of the chief of the OKL General Staff that the radio station in Minsk provide signal support. The Soviet side partially adhered to the request. On the same day an extraordinary session of the Supreme Soviet of the Soviet Union confirmed the adoption of its ''"Universal Military Duty Act for males aged 17 years and 8 months old"'', by which the service draft act of 1937 was extended for another year. Furthermore, the Politburo of the Communist Party approved the proposal of the People's Commissariat of Defense, which envisaged, that the Red Army's existing 51 rifle divisions were to be supplemented to a total strength of 76 rifle divisions of 6,000 men, plus 13 mountain divisions and another 33 ordinary rifle divisions of 3,000 men. On 2 September 1939 the German Army Group North carried out a maneuver to envelop the forces of the Polish (Pomorze Army) that defended the "Polish Corridor" with the result, that the Polish commander General Władysław Bortnowski lost communication with his divisions. The break-through of armored contingents of the German Army Group South near the city of Częstochowa sought to defeat the Polish 6th Infantry Division south of Katowice where the German 5th Armored Division had broken through towards Oświęcim, that captured fuel depots and seized equipment warehouses. To the east detachments of 18th corps of the German 14th Army crossed the Polish–Slovak border near Dukla Pass. The government of the Soviet Union issued directive No. 1355-279сс that approved of the ''"Reorganization plan of the Red Army ground forces of 1939–1940"'', which regulated detailed division transfers and updated territorial deployment plans for all the 173 future Red Army combat divisions. In addition to the reorganized infantry, the number of corps artillery and the reserve of the Supreme High Command artillery was increased while the number of service units, rear units and institutions was to be reduced. By the evening of 2 September enhanced defense and security measures were implemented at the Polish–Soviet border. Per instruction No. 1720 of the border troop commander in the Belorussian Military District, all detachments were set to permanent combat-ready status. The governments of allied Britain and France declared war on Germany on 3 September, but neither undertook agreed-upon military action nor provided any substantial support for Poland. Despite notable Polish success in local border battles, German technical, operational and numerical superiority eventually required the retreat of all Polish forces from the borders towards shorter lines of defense at Warsaw and Lwów. On the same day (3 September), the new Soviet Ambassador in Berlin Aleksei Shkvartsev handed his letter of credence to Adolf Hitler. During the initiation ceremony Shkvartsev and Hitler reassured each other on their commitment to fulfill the terms of the non-aggression agreement. Foreign minister Joachim von Ribbentrop commissioned the German Embassy in Moscow with the assessment of and the report on the likelihood of Soviet intentions for a Red Army invasion into Poland. On 4 September 1939 all German navy units in the northern Atlantic Ocean received order "to follow to Murmansk, via the northernmost course". On the same day, the Central Committee of the Communist Party and the government of the Soviet Union approved of the People's Commissar of Defense Kliment Voroshilov's orders to delay retirement and dismissal of Red Army personnel and young commanders for one month and to initiate full-scale training for all air defense detachments and staff in Leningrad, Moscow, Kaliningrad, Kharkov, in Belorussia and the Kiev Military District. On 5 September 1939 the People's Commissar of Foreign Affairs Vyacheslav Molotov received the German Ambassador Friedrich Werner von der Schulenburg. Upon the ambassador's inquiry with regards to a possible deployment of the Red Army into Poland, Molotov answered that the Soviet government ''"will definitely have to... start specific actions"'' at the right time. ''"But we believe that this moment has not yet come"'' and ''"any haste may ruin things and facilitate the rallying of opponents"''. On 10 September, the Polish commander-in-chief, Marshal Edward Rydz-Śmigły, ordered a general retreat to the southeast towards the Romanian Bridgehead. Soon after, Nazi German officials further urged their Soviet counterparts to uphold their agreed-upon part and attack Poland from the east. Molotov and ambassador von der Schulenburg discussed the matter repeatedly but the Soviet Union nevertheless delayed the invasion of eastern Poland, while being occupied with events unfolding in the Far East in relation to the ongoing border disputes with Japan. The Soviet Union needed time to mobilize the Red Army and utilized the diplomatic advantage of waiting to attack after Poland had disintegrated. On 14 September, with Poland's collapse at hand, the first statements on a conflict with Poland appeared in the Soviet press. The undeclared war between the Soviet Union and the Empire of Japan at the Battles of Khalkhin Gol had ended with the MolotovTojo agreement, signed on 15 September as a ceasefire took effect on 16 September. On 17 September, Molotov delivered a declaration of war to Wacław Grzybowski, the Polish Ambassador in Moscow: Molotov declared via public radio broadcast that all treaties between the Soviet Union and Poland had become void, that the Polish government had abandoned its people as the Polish state had effectively ceased to exist. On the same day, the Red Army crossed the border into Poland.

Soviet invasion of Poland

On the morning of 17 September 1939, the Polish administration throughout the whole territory of the six eastern voivodeships was still fully operational and functioned partly in several additional five voivodeship territories of eastern Poland as schools remained open in mid-September 1939. Polish Army units concentrated their activities on two areas – on southern (Tomaszów Lubelski, Zamość, Lwów) and central (Warsaw, Modlin, and the Bzura river). Due to determined Polish defense and a lack of fuel, the German advance had stalled and the situation stabilized in the areas east of the line AugustówGrodnoBiałystokKobryńKowelŻółkiew – Lwów – ŻydaczówStryjTurka. Rail lines were operational in approximately one-third of the territory of the country as both, cross-border passenger and cargo traffic, was maintained with five neighboring countries (Lithuania, Latvia, Soviet Union, Romania, and Hungary). In Pińsk, assembly of the PZL.37 Łoś planes continued in a PZL factory that had been moved out of Warsaw. A French Navy ship carrying Renault R35 tanks for Poland approached the Romanian port of Constanta. Another ship, with artillery equipment, had just left Marseilles. Altogether, seventeen French cargo ships were sailing towards Romania, carrying fifty tanks, twenty airplanes, and large quantities of ammunition and explosives. Several major cities were still in Polish hands, such as Warsaw, Lwów, Wilno, Grodno, Łuck, Tarnopol and Lublin (captured by German troops on 18 September). According to historian and author Leszek Moczulski, approximately 750,000 soldiers remained active in the Polish Army, whereas Czesław Grzelak and Henryk Stańczyk arrived at an estimated strength of 650,000 troops. On 17 September 1939 the Polish Army, although weakened by weeks of fighting, still was a coherent force. Moczulski asserted, that the Polish Army was ''still bigger than most European armies and strong enough to fight the Wehrmacht'' for a long time. On the BaranowiczeŁuniniecRówne line, rail transport of troops from the northeastern corner of the country towards the Romanian Bridgehead resumed day and night (among these troops were the 35th Reserve Infantry Division under Colonel Jarosław Szafran, the so-called "Grodno Group" ("Grupa grodzieńska") of Colonel Bohdan Hulewicz) and the second largest battle of the September Campaign – the Battle of Tomaszów Lubelski, started on the day of the Soviet invasion. According to Leszek Moczulski, around 250,000 Polish soldiers were fighting in central Poland, 350,000 were getting ready to defend the Romanian Bridgehead, 35,000 were north of Polesie, and 10,000 were fighting on the Baltic coast of Poland, in Hel and in Gdynia. Due to the ongoing battles in the area around Warsaw, Modlin, the Bzura, at Zamość, Lwów and Tomaszów Lubelski, most German divisions had been ordered to fall back towards these locations. The area that remained under control of the Polish authorities encompassed around – approximately wide and long – from the Daugava in the north to the Carpathian Mountains in the south. Radio Baranowicze and Radio Wilno ceased to broadcast on 16 September after having been bombed by German Luftwaffe units, while Radio Lwów and Radio Warsaw II still aired as of 17 September.

Opposing forces

A Red Army force of seven field armies with a combined strength between around 450,000 and 1,000,000 troops entered eastern Poland on two fronts. Marshal Semyon Timoshenko commanded the invasion on the Ukrainian Front and General Mikhail Kovalyov led the Red Army on the invasion on the Belarussian Front. When drawing up the defensive Plan West of 1938, Poland's military strategists assumed the Soviet Union would remain neutral during a conflict with Germany. As a result, Polish commanders focused on massive troop deployment designs and elaborate operational exercises in the west in order to successfully counter all German invasion attempts. This concept, however, would only leave a Border Protection Corps of approximately 20 under-strength battalions with a maximum strength of 20,000 troops assigned to defend the entire eastern border. During the Red Army invasion on 17 September, most Polish units had engaged in a fighting retreat towards the Romanian Bridgehead, where, according to overall strategic plans all divisions were to regroup and await new orders in coordination with allied British and French forces.

Military campaign

Commander-in-chief Edward Rydz-Śmigły was initially inclined to order the eastern border forces to oppose the invasion, but was dissuaded by Prime Minister Felicjan Sławoj Składkowski and President Ignacy Mościcki. At 4:00 a.m. on 17 September, Rydz-Śmigły ordered the Polish troops to fall back, stipulating that they only engage Soviet troops in self-defense. However, the German invasion had severely damaged the Polish communication systems and caused command and control problems for the Polish forces. In the resulting confusion, clashes between Polish and Soviet forces occurred along the border. General Wilhelm Orlik-Rückemann, who took command of the Border Protection Corps on 30 August, received no official directives after his appointment. As a result, he and his subordinates continued to actively engage Soviet forces, eventually dissolving the unit on 1 October. The Polish government refused to surrender or negotiate a peace and instead ordered all units to evacuate Poland and reorganize in France. The day after the Soviet invasion had started, the Polish government withdrew into Romania. Polish units proceeded to manoeuvre towards the Romanian bridgehead area, repulsing German attacks on one flank and clashing occasionally with Soviet troops on the other. In the days following the evacuation order, the Germans defeated the Kraków Army and the Lublin Army at the Battle of Tomaszów Lubelski. Soviet units would meet their German counterparts during the advancement from opposite directions. Notable occurrences of co-operation in the field among the two armies were reported, for example, as ''Wehrmacht'' troops passed the Brest Fortress, which had been seized after the Battle of Brześć Litewski to the Soviet 29th Tank Brigade on 17 September. German General Heinz Guderian and Soviet Brigadier Semyon Krivoshein on 22 September held a joint parade in the town. Lwów (now Lviv) surrendered on 22 September, several days after German troops had abandoned their siege operation and allow Soviet forces to take over. Soviet forces took Wilno (now Vilnius) on 19 September after a two-day battle, and Grodno on 24 September after a four-day battle. By 28 September, the Red Army reached the Narew - Western Bug - Vistula - San rivers line – the border that had been agreed upon in advance with Germany. Despite a tactical Polish victory on 28 September at the Battle of Szack, the outcome of the larger conflict was never in doubt. Civilian volunteers, militia contingents and regrouped army units held out against German forces in and around of the Polish capital, Warsaw, until the end of September, as the Modlin Fortress, north of Warsaw, surrendered after an intense sixteen-day battle. On 1 October, Soviet troops pushed Polish units into the forests at the battle of Wytyczno, during one of the last direct confrontations of the campaign. Several isolated Polish garrisons managed to hold their positions long after being surrounded, such as those in the Volhynian Sarny Fortified Area which only surrendered on 25 September. The last operational unit of the Polish Army was General Franciszek Kleeberg's Independent Operational Group Polesie. Kleeberg surrendered on 6 October after the four-day Battle of Kock, effectively ending the September Campaign. On 31 October, Molotov reported to the Supreme Soviet: ''"A short blow by the German army, and subsequently (by) the Red Army, was enough for nothing to be left of this (lit.) bastard (state) (russian: ублюдок), created at the Treaty of Versailles"''.

Domestic reaction

The response of non-ethnic Poles to the situation caused considerable complications. Many Ukrainians, Belarusians and Jews welcomed the invading troops. Local Communists gathered people to welcome the Red Army troops in the traditional Slavic way by presenting bread and salt in the eastern suburb of Brest. A sort of triumphal arch on two poles, decked with spruce branches and flowers was fashioned for this occasion. A slogan in Russian on a long red banner, glorifying the USSR and welcoming the Red Army, crowned the arch. The event was recorded by Lev Mekhlis, who reported to Stalin that the people of the West Ukraine welcomed the Soviet troops "like true liberators". The Organization of Ukrainian Nationalists rebelled against Polish rule and Communist partisans stirred up local revolts, such as in Skidel.

International reaction

France and Britain refrained from a critical reaction to the Soviet invasion and annexation of Eastern Poland, since neither country expected or wanted a confrontation with the Soviet Union at that time. Under the terms of the Polish-British Common Defence Pact of 25 August 1939, Britain had promised assistance if a European power attacked Poland. A secret protocol of the pact, however, specified that the European power referred to Germany. When Polish Ambassador Edward Raczyński reminded Foreign Secretary Lord Halifax of the pact, he was bluntly told that it was Britain's exclusive right to declare war on the Soviet Union or not. British Prime Minister Neville Chamberlain considered making a public commitment to restore the Polish state but eventually issued only general condemnations. This stance represented Britain's attempt at balance as its security interests included trade with the USSR that would support its war effort and might lead to a possible future Anglo-Soviet alliance against Germany. Public opinion in Britain was varied among expressions of outrage at the invasion on the one hand and a perception that Soviet claims in the region were reasonable on the other. While France had made promises to Poland, including the provision of air support, these were not honoured. A Franco-Polish Military Alliance was signed in 1921 and amended thereafter. The agreements were not strongly supported by the French military leadership, though and the relationship deteriorated during the 1920s and 1930s. The French considered the German-Soviet alliance to be fragile and overt denunciation of, or action against the Soviet Union would serve neither France's nor Poland's best interests. Once the Soviets had occupied Poland, the French and the British realized there was nothing they could do for Poland on short notice and plans for a long-term victory were devised instead. The French forces, that had advanced tentatively into the Saar region in early September, retreated behind the Maginot Line upon the Polish defeat on 4 October. On 1 October 1939, Winston Churchill stated in public: Since the Molotov-Ribbentrop Pact was not an official alliance, modern scholarship has described the German and Soviet cooperation in the invasion of Poland as co-belligerence.

Aftermath

In October 1939, Molotov reported to the Supreme Soviet that the Red Army had suffered 737 deaths and 1,862 wounded men during the campaign,a casualty rate that widely contradicted Polish specialist's claims of up to 3,000 deaths and 8,000 to 10,000 wounded. On the Polish side, 3,000 to 7,000 soldiers died fighting the Red Army as between 230,000 and 450,000 men were taken prisoners. The Soviet troops regularly failed to honour commonly accepted terms of surrender. In some cases, after Polish soldiers had been promised to retreat freely Soviet troops arrested them once they had laid down their arms. The Soviet Union had ceased to recognise the Polish state upon the start of the invasion. Neither side issued a formal declaration of war. This decision had significant consequences and Rydz-Smigly would be later criticised for it. The Soviets killed tens of thousands of Polish prisoners of war during the campaign itself. On 24 September, the Soviet soldiers killed 42 staff and patients of a Polish military hospital in the village of Grabowiec, near Zamość. Soviet troops also executed all the Polish officers they captured at the Battle of Szack on 28 September 1939. The NKVD killed 22,000 Polish military personnel and civilians in the Katyn massacre. Torture was widely used by the NKVD in various prisons, especially in small towns. The Poles and the Soviets re-established diplomatic relations in 1941, following the Sikorski–Mayski Agreement. The Soviets broke off talks again in 1943 after the Polish government had demanded an independent examination of the recently discovered Katyn burial pits (Katyn massacre). On 28 September 1939, the Soviet Union and Germany signed the German–Soviet Treaty of Friendship, Cooperation and Demarcation, readdressing the secret terms of the Molotov–Ribbentrop Pact. Lithuania was incorporated into the Soviet sphere of influence and the border within Poland was shifted to the east, increasing German territory. By this arrangement, often described as a fourth partition of Poland, the Soviet Union secured almost all Polish territory east of the line of the rivers Pisa, Narew, Western Bug and San. This amounted to about territory, inhabited by 13.5 million Polish citizens. The border created in this agreement roughly corresponded to the Curzon Line drawn by the British in 1919, a point that would successfully be utilized by Stalin during negotiations with the Allies at the Teheran and Yalta Conferences. The Red Army had originally sown confusion among the population, claiming that they had come to save Poland from Nazi occupation.Davies (1996) pp. 1001–1003 Their advance surprised Polish communities and their leaders, who had not been advised on how to respond to a Soviet invasion. Polish and Jewish citizens might initially have preferred Soviet rule to Nazi German rule. However, the Soviet authorities quickly imposed Communist ideology and administration upon their new subjects and suppressed the traditional ways of life. For instance, the Soviet government confiscated, nationalized and redistributed all private Polish property. During the two years following the annexation, the Soviet police forces arrested approximately 100,000 Polish citizens. Due to denied access to secret Soviet archives, estimates of the number of Polish citizens deported to Siberia and the total number of perished persons under Soviet rule, remained guesswork for decades after the end of the war. Estimates among the numerous publications varied between 350,000 and 1,500,000 for civilians deported to Siberia and between 250,000 and 1,000,000 for the total number of civilians who had lost their lives. With the opening of the Soviet secret archives after 1989, more realistic and potentially smaller numbers were established. In August 2009, on the occasion of the 70th anniversary of the Soviet invasion, the Polish Institute of National Remembrance announced that research estimates on the number of people deported to Siberia and those who had perished under Soviet wartime rule amounted to around a total of 150,000 Polish citizens.

Belorussia and Ukraine

According to the last official Polish census the 13.5 million inhabitants in the newly annexed territories consisted of 38% Poles (5,1 million), 37% Ukrainians (4,7 million), 14.5% Belarusians, 8.4% Jews, 0.9% Russians and 0.6% Germans. The elections of 26 October in the Belorussian and Ukrainian communities were utilized to bestow some degree of legitimacy upon the annexation. The Belarussians and Ukrainians in Poland had been alienated by the former Polonization policies of the Polish government and the repression of separatist movements and thus felt little loyalty towards the Polish cause. Not all Belarussians and Ukrainians, however, trusted the Soviet regime. In practice, the poor generally welcomed the Soviets, and the elites tended to join the opposition, despite supporting the reunification itself. The Soviets eventually introduced complete Sovietization policies in Western Belorussia and Western Ukraine, including compulsory collectivization throughout the whole region. In the process, all political parties and public associations were ruthlessly destroyed and their leaders imprisoned or executed as "enemies of the people". The Soviet authorities also suppressed the anti-Polish Organization of Ukrainian Nationalists for an independent and undivided Ukrainian state, that had actively resisted the Polish regime since the 1920s. The unifications of 1939 nevertheless proved to be decisive events in the history of the Ukraine and Belarus, as these created the precursors to the two republics, that eventually achieved independence after the fall of the Soviet Union in 1991.

Communist and later censorship

Politburo jargon would stylize the invasion a "liberation campaign" from its inception. The term would consequently be utilized throughout Soviet history among official references and publications. Despite the 1979 publication of a recovered copy of the secret protocols of the Molotov–Ribbentrop Pact in the western media, the Soviet Union continued to deny their existence until 1989. Attempts to record the factual and fully detailed history of the 1939 Soviet invasion and its consequences have only been made after the fall of the USSR. Soviet censorship and inaccessible archives prevented serious historic research until 1991. Censorship was also applied in the People's Republic of Poland in order to preserve the image of ''"Polish-Soviet friendship"'' which was promoted by the two Communist governments. Accounts of the 1939 campaign were to portray the invasion in accord with the Soviet Politburo narrative - a reunification of the Belarusian and Ukrainian peoples and the liberation of the Polish people from ''"Oligarchic Capitalism"''. The authorities strongly discouraged any study in depth and the teaching of the subject. Various underground publishers and artists addressed the issue, as in the 1982 protest song "''Ballada wrześniowa'' by Jacek Kaczmarski.


Russia


In a 2009 letter to the Polish daily newspaper ''Gazeta Wyborcza'', Russian Prime Minister Vladimir Putin stated that the Molotov–Ribbentrop Pact of August 1939 was "immoral". In 2015, however, as President of the Russian Federation, he commented: "In this sense I share the opinion of our culture minister (Vladimir Medinsky praising the pact as a triumph of Stalin's diplomacy) that this pact had significance for ensuring the security of the USSR". In 2016, the Russian Supreme Court upheld the sentence of a lower court, that had found blogger, Vladimir Luzgin, guilty of the "rehabilitation of Nazism" after he had posted a text on social media that characterized the invasion of Poland in 1939 as a joint effort by Nazi Germany and the Soviet Union.

See also

* History of Poland (1939–1945) * Germany–Soviet Union relations, 1918–1941 * Polish Operation of the NKVD 1937-1938 * Gestapo–NKVD conferences 1939-1940 * Soviet repressions of Polish citizens (1939–1946) * Evacuation of Polish civilians from the USSR in World War II * Russian involvement in regime change * Cursed soldiers 1944-1947


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External links


Molotov–Ribbentrop Pact
{{Nazi-Soviet relations Category:1939 in the Soviet Union Category:Conflicts in 1939 Category:September 1939 events Category:October 1939 events Category:Military operations involving the Soviet Union Category:Polish–Russian wars Category:Invasion of Poland Category:Soviet military occupations Category:Stalinism in Poland Category:Belarus in World War II Category:Western Belorussia (1918–1939)