The Soviet Union knew the German Nazis would invade their nation to get their raw materials, oil and land. They signed a non-aggression pact with Germany hoping to buy time and build up their forces. Then German Nazis did invade Russia and the USSR was forced into the war.
Germany's attack code named Barbarossa on the Soviet Union required no
less then placing it in a state of war.
USSR truly entered the war with the invasion of Russia. They were wasting the time with the Russo-Finnish war.
Yes
Korea did not fight in world war 2. So the answer is no.
The USSR by invading country's and not leaving them after the war.
China, USA and USSR
Soviet Russia
joseph stalin
USSR and america
Germany and USSR
USSR and USA.
US and USSR
USA and USSR