The primary contribution of the U.S.S.R. (with U.S. material assistance) to the defeat of the Nazis is absolutely undeniable. But I don't normally see "Stalin"

The primary contribution of the U.S.S.R. (with U.S. material assistance) to the defeat of the Nazis is absolutely undeniable. But I don't normally see "Stalin" and "hero" used on purpose in the same sentence either...