While the Soviets did harbour imperial ambitions against neighbouring states (Poland, Finland), this:
> had Hitler not attacked first, Stalin would probably just attack Germany within a short period of time
is blatantly false, and insultingly so given the millions of Soviet citizens who paid a bloody price for Stalin's total lack of readiness at the German border or mobilization against the Nazis.
No it's not. The only “Historian” to say so was the so-called Suvorov, a transfuge of the NKVD. And his theories have been thoroughly dismantled by the whole academia.