The Soviet-Finnish war of 1939-1940 (Soviet-Finnish war, fin. talvisota — Winter war, Swedish. vinterkriget) — armed conflict between the Soviet Union and Finland between 30 November 1939 to 12 March 1940.
26 November 1939 the Soviet government sent a protest note to the Finnish government regarding the shelling, which, according to the Soviet side, was made from Finnish territory. The responsibility for initiating hostilities was fully vested in Finland. The war ended with the signing of the Moscow peace Treaty. In the USSR turned out to be 11 % of Finnish territory (the second largest city Vyborg). 430 thousand Finnish residents were displaced by force Finland from the war zone into the country and lost their belongings.
According to some historians, this offensive operation the Soviet Union against Finland, the Second world war. The outbreak of hostilities led to the fact that in December 1939 the Soviet Union as the aggressor was expelled from the League of Nations.