Winter War

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After Soviet involvement in the Finnish Civil War in 1918, no formal peace treaty was signed. In 1918 and 1919, Finnish volunteers conducted two unsuccessful military incursions across the Soviet border, the Viena and Aunus expeditions, to annex Karelian areas according to the Greater Finland ideology of combining all Finnic peoples into a single state. In 1920, Finnish communists based in the USSR attempted to assassinate the former Finnish White Guard Commander-in-Chief, Marshal Carl Gustaf Emil Mannerheim. On 14 October 1920, Finland and Soviet Russia signed the Treaty of Tartu, confirming the old border between the autonomous Grand Duchy of Finland and Imperial Russia proper as the new Finnish–Soviet border. Finland also received Petsamo, with its ice-free harbour on the Arctic Ocean. Despite the signing of the treaty, relations between the two countries remained strained. The Finnish government allowed volunteers to cross the border to support the East Karelian uprising in Russia in 1921, and Finnish communists in the Soviet Union continued to prepare for a revanche and staged a cross-border raid into Finland, called the Pork mutiny, in 1922. In 1932, the USSR and Finland signed a non-aggression pact, which was reaffirmed for a ten-year period in 1934. While foreign trade in Finland was booming, less than one percent of Finnish trade was with the Soviet Union. In 1934, the Soviet Union joined the League of Nations.