Q. Which two countries fought the "Winter War"?
Answer: Soviet Union and Finland
Notes: The Soviet Union and Finland fought the Winter War from 30 November 1939 to 13 March 1949 in Eastern Finland, in which the Soviet Union invaded Finland when Finland rejected the Soviet Union's demand to cede certain territories to the Soviet Union. The Soviet Union suffered heavy military losses though it got several substantial territories along Lake Ladoga and further north, through the Moscow Peace Treaty, which was signed to end the Winter War.