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The idea basically comes from a YouTube video where this guy claims the USSR would have beaten all of Europe in a "clean" war (probably means conventional warfare).
So lets take a turn at this, shall we?
Its 1940. The USSR decides to go after entire Europe.
Billigrents:
The USSR
vs.
UK
France
Weimar Germany (decided to get rid of Hitler because here the USSR starts WWII)
Poland
Italy
and basically every other country in Europe