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Russo-Finnish War, also called the Winter War, (November 30, 1939–March 12, 1940), war waged by the Soviet Union against Finland at the beginning of World War II, following the conclusion of the German-Soviet Nonaggression Pact (August 23, 1939)
Specifically, the Winter War provides insight into Soviet imperialism and its concerns over German aggression and forms a crucial portion of the German decision to invade Russia in the summer of 1941.
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