I think the drainage was a lot worse on the Nazi side. The Nazis took their country's resources and started a big war, invading Poland and much of Europe, and then (what ultimately destroyed them) Russia.

The USSR never committed so many resources to war; they engaged in the "cold war", but that was really about it. Germany was fighting an active war on two fronts and got crushed in the middle. The Soviets just built a bunch of bombs and walls (after the action in WWII).