Quote:
Originally Posted by U777
Even if Japan wanted to help, the war they fought against the US considerably tied up their resources.
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I think ediko is presuming that Japan forgoes it's historical surprise attack on December 7th, 1941 on the US and instead joins Germany in the attack on the Soviet Union. Hitler's invasion of the USSR began on June 22, 1941 six months before Pearl Harbor. If Japan had soon joined in as well, it would have presented Stalin with a two-front war.
The Imperial Japanese Army, in particular at one time favored a move north out of Manchuria against Vladivostok and Siberia as they saw Russia as their traditional enemy. A joint German-Japanese attack on the Soviet Union might have invoked some diplomatic protests from the US, but given the isolationist and anti-communist attitudes of the country, probably no military ones.