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Post-war expulsion and deportation

After World War II, the German population of the Kaliningrad Oblast, formerly East Prussia, was expelled and the depopulated area resettled by Soviet citizens, mainly by Russians. Between 1944 and 1953 a variety of groups from the Black Sea region — Kurds, Iranians, Greeks, Bulgarians, Armenians, and Hemshins were deported away from the Soviet border regions in Crimea and the Transcaucasus.

Poland and Soviet Ukraine conducted population exchanges; Poles who resided east of the established Poland–Soviet border were deported to Poland (c.a. 2,100,000 people) and Ukrainians that resided west of the established Poland-Soviet Union border were deported to Soviet Ukraine. Population transfer to Soviet Ukraine occurred from September 1944 to April 1946 (ca. 450,000 people). Some Ukrainians (ca. 200,000 people) left southeast Poland more or less voluntarily (between 1944 and 1945).