You have a valid point. I call the war in the East "The Great German-Russian War", inasmuch as it was a war of its own. But keep in mind that in Russian schoolbooks, the Soviet Union whipped Nazi Germany. In British schoolbooks, Britain defeated the Nazis. And of course, in US schoolbooks, John Wayne, and Tyrone Power whipped the entire Axis all by themselves.
It took a World-wide effort to defeat the Axis. And so, everyone who worked for the various resistance groups, worked in a munitions plant, toted a rifle, or swabbed a deck, can be said to have "won" the war.