Easiest question ever. Russia is the single most evil and destructive country in the world. It's a vile cancer that has only infected the world and brought nothing but death and devestation in pretty much its entire history.
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And BRTD, how WW2 can be considered can be considered as a good thing made by Russians. They were basically the allies of Hitler until he decided to invade them.
You conveniently omit a lot of details. The biggest of which being that the soviets were willing to intervene in Czechoslovakia... as long as Britain, France contributed troops as well. Munch only served to confirm Soviet paranoia that Hitler was the West's battering ram, so why shouldn't they partition Poland, and force France to bear the brunt of the fighting?
It wasn't Stalin's fault that France collapsed so quickly, derailing his plans.