To what end? Partitioning Poland between them?
Hitler wanted a war. Thus, this didn't happen.That was a goal of the OTL Molotov-Ribbentrop Pact, but that's not where I was going. Maybe I can rephrase it this way: If the Germans invade Poland after the Soviets do, can the Germans present the invasion not as a war of aggression, but as military intervention? Does this give the British and the French an excuse to not declare war?
Does that mean it couldn't happen?