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National socialist Third Reich (Italy was fascist) was conquered by Allies, not any single country and the victory wouldn't be possible without the effort of all these countries.
https://en.wikipedia.org/wiki/Allies_of_World_War_II
Not disputing the enormous sacrifice by Soviet people, it should be remembered that USSR was *not* among Allies in 1939 when the world started.
Quite the opposite - it joined Third Reich in invasion on Eastern Europe in 1939 and supported it until 1941.