[gdy]

"if the russians hadn't made a deal with the nazis to steal poland"

And how exactly do you know this?

Maybe if the USSR hadn't bought the time and buffer space by this deal, the Germany would've taken the whole Poland and continued with the attack on the USSR? Maybe the West would've been standing aside (like it did during the Munich Betrayal, like it did during the Phony War) and watching with satisfaction how Nazies are killing Communists? And later watching how all Slavic and Jewish population of occupied territories gets exterminated?