As we know WWII ended with the Soviets conquering half Europe. And a lot of WWII scenarios that doesn't have Germany winning after it attacks the USSR involves this.
So my question is, is there any possible post-Stalingrad scenario in which Stalin is stopped from conquering other countries and he just simply recovers proper Russian territory? Any possible means are accepted as long as they are not ASBs, changes in military strategy, coups against Hitler, etc.