The way history went i would agree that a conflict between Russia and Germany was inevitable.
However, In response to that i would argue that Germany brought the situation upon itself through the conquering of Poland.
If Germany did not invade Poland there would not have been any war in the west and Poland would have a great strategic/political cushion between Germany's border and Russia's.
My only question would be, I wonder what would have happened if Russia alone invaded Poland?

__________________
Never, never, never believe any war will be smooth and easy, or that anyone who embarks on the strange voyage can measure the tides and hurricanes he will encounter. The statesman who yields to war fever must realize that once the signal is given, he is no longer the master of policy but the slave of unforeseeable and uncontrollable events. -- Sir Winston Churchill