Actually, Stalin and Hitler were partners from the signing of their nonaggression pact in 1939 right up until June 22, 1941 when Germany invaded the Soviet Union.
But then, WE were GREAT "FRIENDS" of the USSR after that, until WW II ended.
OTOH...when Hitler and the Nazi began they were 100% fighting the German Commies for power. Which IS what I stated and which IS 100% factual.