Challenge: Europe+Japan vs USSR as WW2.

Pretty much this. It works best if the US remain neutral in the conflict.
EDIT; it must have the same heads of state (Churchill, Hitler, Mussolini, Hirohito and Stalin) as OTL.
 

Anaxagoras

Banned
Japan is easy- just keep things in the Pacific pretty much the same as IOTL.

Creating an alliance between the French and British on one side and the fascist governments in Germany and Italy on the other side is more difficult, but not undoable. Public perceptions have to change to make the French and British people fear Communism more than they fear Fascism. Greater public awareness of Stalinist crimes, with less aggressive rhetoric from Hitler and Mussolini, would make a big difference. Combine that with a more assertive foreign policy on the part of Stalin, perhaps against Finland, Poland, and Romania, and you could get it to work.
 
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