I don't get your post :p
1. it's stupid to invade russia/former ussr ever. you can't invade that country and expect to be successful. see: napolean (captures moscow. russian army withdraws. winter falls. napolean gets fucked--in a nutshell). for an easy comparison, think about invading the us
2. it was stupid to open a second front, especially w/limited manpower and resources (in a nutshell)
so, in a sense, i was echoing that point in your post