1941
The 1979 Soviet Invasion of Afghanistan.
The Soviet Union also invaded Poland around the same time. Germany invaded Poland on September 1, 1939 from the West, and the Soviet Union invaded Poland on September 17th of the same year from the East.
The answer to that is not agreed upon. The most agreed upon year would be 1941. Within that the best day would be the invasion of the Soviet Union on 22nd June.
Canada boycotted the 1980 Summer Olympic Games in Moscow in protest to the Soviet Union's invasion of Afghanistan in 1979.
The Prague Spring began on 5th of January, 1968 as the reformer Dubcek came to power, and was ended by a Soviet invasion on 21st of August, 1968.
The Five year plans of the Soviet Union were started Between 1928 and 1932.
Stalin industrialized the Soviet Union by creating five year economic plans
1991
The 'Barbarossa' battles took place throughout the western portion of the Soviet Union in 1941. Serving as the code-name for the German invasion of the Communist nation in that year, 'Barbarossa' raged from Leningrad in the north to Moscow in the center to Rostov in the south of the Soviet Union's western region.
The year generally given for the foundation of the Soviet Union is 1922. The Soviet Union was founded on December 29-30, 1922 when the Treaty of the Soviet Union was entered into by Russia, Ukraine, Belorussia and the Transcaucasus Federation (Georgia, Armenia and Azerbaijan).
1941
in 1937