The Poles just recently had their 'full' independence and were not about to give it away by trusting the Russians. The Western allies did in fact attempt to bring Russia in to support the Poles if Germany invaded but the Poles would hear non of it. So, I believe that the Russians would have marched into Poland regardless of what the Poles thought.

Now, how does this change the military situation? Hitler knew (or thought so) that the Western allies would do nothing if he invaded Poland just like they did nothing during the occupation of the Rhineland etc.

His only worry was the USSR. He did not know how they would react which is why he sent Ribbentrop to close the Russo-German Pact. So, I would think that Hitler would have proceeded with the invasion of Poland with contingencies to continue Eastward if the USSR intervened. Had this happened, Hitler would have had a two front war a lot sooner.

Question would be, how would the Western Allies respond with Hitler busy in the East fighting the Russians? Would they still sit out the war (sitzkrieg) or actually invade Germany while her back was turned?

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American by birth, TEXAN by the grace of GOD!