Why did the soviet union join the allies? stalin was afraid of hitler. hitler had broken a pact and attacked. hitler was becoming too powerful in eastern europe. stalin wished to take control of territories captured by germany?

I think the correct answer would be the second option. The Soviet Union joined the allies because Hitler had broken a pact and attacked. The pact was called the German-Soviet nonaggression pact. This pact was regarded by Hitler as a tactical move. It was signed on the year 1940 and after a year Hitler attacked the Soviet Union.