Hmmm, have you considered giving Japan jet fighters instead of Germany, just to make it a little easier on Russia without unbalancing the teams?
Japan somehow had about 100 Me-262 in underground facilities at mt. fuji? ready for action if we had invaded. I have read this in a few places… i am not sure that its mt. fuji however.
at the wars end i also read they “used” 2 of these in actions over Japan before the close of the war.