Thanks for all the replies.
I guess with all the discussions about Germany into Spain, having Italy declare war in 1939, etc., all of which the game attempts to handle with various rules, I would think it would do the same thing with Russia. Of course the designers assumed that at some point Russia would have attacked Germany, but I am not sure if Stalin would ever had done that in RL. He was an oportuntist, not someone that would take a chance like attacking a heavily fortified border.
Also without the lessons learned from 41/42, the Russian army would have been very brittle imho. So even if Germany was outnumbered, I still think they could have contained and really had opportunities to wipe out huge numbers of Russians. Also, if Stailn was the aggressior, where is all the dissent as he could no longer declare a war for the Motherland? The support for the war would have been dramticly different, especially since Stalin was the one that broke the treaty and not Germany. Of course, if Stalin got the right deal from the Allies, then he definately would have join in.
It just seems like there should be some kind of entry pool for Russia similar to the US to better reflect this reality. Both Allied and Axis actions could influence it same as the US. Just some thinking out loud
I realize this is a game, blah, blah,. But if you are going to allow all this weirdness in '39/40, then that should have been better extended into the entire game, versus just the beginning.