Answer:
Russia and Germany were briefly allied enemies.
Explanation:
Russia was under "communist" leadership while Germany was fascist. They did not have similar goals, in fact in the end they both wanted to take Poland. However, they had a common enemy in Western Europe and the United States, which is why they fought as "allies" for the first bit of WWII.
It depends on which course you're studying. Different nomads had different reasons. I'm sorry I wasn't able to give you a better answer.
