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Soviet repressions of Polish citizens (1939–1946)
The Katyn Massacre, 1940 HU106212.jpg
Bodies of Polish prisoners-of-war by the mass graves of the Katyn massacre, awaiting forensic examination, 30 April 1943
 
Soviet invasion of Poland
  • 500,000 Polish nationals imprisoned before June 1941 (90% male)
  • 22,000 Polish military personnel and officials killed in the Katyn massacre alone
  • 1,700,000 Poles deported to Siberia in 1939-1941
  • 100,000 women raped during the Soviet counter-offensive (est.)
  • 150,000 killed by the Soviets

In the aftermath of the German and Soviet invasion of Poland, which took place in September 1939, the territory of Poland was divided in half between Nazi Germany and the Soviet Union. The Soviets had ceased to recognise the Polish state at the start of the invasion. Since 1939 German and Soviet officials coordinated their Poland-related policies and repressive actions. For nearly two years following the invasion, the two occupiers continued to discuss bilateral plans for dealing with the Polish resistance during Gestapo-NKVD Conferences until Germany's Operation Barbarossa against the Soviet Union, in June 1941.

The Molotov–Ribbentrop Pact was broken and the new war erupted, the Soviets had already arrested and imprisoned about 500,000 Polish nationals in the Kresy macroregion including civic officials, military personnel and all other "enemies of the people" such as clergy and the Polish educators: about one in ten of all adult males. There is some controversy as to whether the Soviet Union's policies were harsher than those of Nazi Germany until that time. An estimated 150,000 Polish citizens were killed by Soviet repressions.

Aftermath of the Soviet invasion of Poland

The Soviet Union took over 52.1% of the territory of Poland (circa 200,000 km²) with over 13,700,000 citizens at the end of the Polish Defensive War. Regarding the ethnic composition of these areas: ca. 5.1 million or 38% of the population were Polish by ethnicity (wrote Elżbieta Trela-Mazur), with 37% Ukrainians, 14.5% Belarusians, 8.4% Jews, 0.9% Russians and 0.6% Germans. There were also 336,000 refugees from areas occupied by Germany, most of them Jews (198,000). All Polish territories occupied by USSR were annexed to the Soviet Union with the exception of the area of Wilno, which was transferred to Lithuania.

On 28 September 1939, the Soviet Union and Germany had changed the secret terms of the Molotov–Ribbentrop Pact. The formerly sovereign Lithuania was moved into the Soviet sphere of influence and absorbed into the USSR as the brand new Lithuanian SSR among the Soviet republics. The demarcation line across the center of Poland was shifted to the east, giving Germany more Polish territory. By this new and final arrangement – often described as a fourth partition of Poland, the Soviet Union secured the lands east of the rivers Pisa, Narew, Bug and San. The area amounted to about 200,000 square kilometres, which was inhabited by 13.5 million formerly Polish citizens.

Initially, the Soviet occupation gained support among some citizens of the Second Polish Republic. Some members of the Ukrainian population welcomed the unification with Soviet Ukraine. The Ukrainians had failed to achieve independence in 1919 when their attempt at self-determination was crushed during the Polish–Soviet and Polish-Ukrainian Wars. Also, there were pre-war Polish citizens who saw the Soviet NKVD presence as an opportunity to start political and social agitation. Many of them committed treason against the Polish state by assisting in round-ups and executions of Polish officials. Their enthusiasm however faded with time as it became clear that the Soviet repressions were aimed at all peoples equally.

Soviet rule