We know that Stalin killed more people than Germany and Japan put together, so his possible expansion in Japan could have been the worst horror for that country, but in that precise period USSR was in a condition so terrible that it couldn't have afforded any military effort more than invading Eastern Europe (again, as it already did it, on a lesser scale, when it was still on friendly terms with Nazi Germany, after the Molotov-Ribbentrop pact), with the excuse of freeing it from a German Army that by then was already falling to pieces under the American attacks on the Western and Southern front and for its own demented and suicide strategic and logistic errors on the Eastern one.







