The Soviet Union joined the Allied Powers during WW2 because Germany, who were supposed to be their ally, invaded part of the Soviet Union so they wanted to get their land back so they joined the Allied Powers.
August 9, 1945, but Soviet Union fought with Japan in Soviet-Japanese Border War since 1938. July 29, 1938 – August 11, 1938(Battle of Lake Khasan) and May 11 - September 16, 1939 (Battle of Khalkhin Gol). It's not part of ww2 officialy, but ww2 had already started during it.
Yes, Joseph Stalin did in fact gain power in the soviet Union.He gained a lot of his power after WW2 because he was seen as a hero to the soviet union after the soviets crushed the German military in WW2.
Yugoslavia's leader who kept his country independent of the Soviet Union after WW2 was Jozip Broz Tito. Tito was a nickname he adopted when living underground as Secretary of the Yugoslavian Communist Party before the WW2.
The end of WW2 left these two countries as the only superpowers. The United States saw the Soviet Union as a revolutionary communist expansionist threat. The Soviet Union saw the United States as a counterrevolutionary imperialist threat.