Because e didn't want to spend the rest of his life in a Siberian prison camp. Also the war between Germany and Russia was pretty personal because the n@zis viewed Russians as sub human I believe.
English
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They viewed any non-Arians as sub-human.
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Yeah, but those two had a grudge against each other anyways.
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Who didn't have a grudge against each other pre WWII?
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I think the USA and Italy got along well enough.