Invading France would risk an eventual Soviet invasion of Nazi Germany, though.
Not any more then it did OTL, what with the non-aggression pact and Stalin being cautious and all. Militarily, Hitler believed Russia an afterthought... a bankrupt regime of cultureless barbarians squatting in the ruins of a civilization whose only greatness had been transplanted onto it by its now usurped ruling class (Hitler was fond of pointing to all the German blood in the Czars).
Hitler actually wanted to invade France immediately after the war with Poland, and was only stopped by his horrified generals stalling until winter arrived. It's pretty clear that whatever his immediate reaction might have been to the Allies' own reaction to his attack on Poland, Hitler had been itching to have a go at France for years. Hitler was also fully aware of the increasing pace of French re-armament, something he harangued his generals with repeatedly in October of 1939 when they pleaded with him for more time to rest and plan. Basically, so long as France was mobilizing and re-arming, Hitler was always going to push to attack them as soon as possible.
There's a risk that when the Soviets attack Finland that Britain declares war on them. If that happens Germany is may do the same.
Which is why Stalin probably doesn't attack Finland in the winter 1939/40. He only did that OTL when the rest of Europe was embroiled in war with itself. So the IATL Winter War is liable to come in 1940/41 once Hitler attacks the French.
A Rhine border might be problematic due to logistics, though. After all, there won't be any Lend-Lease to the Soviet Union in this TL.
Given that a 1940 Barbarossa would see the Germans stall out around the D'niepr river line, the lack of L-L doesn't matter much in the face of all the extra economic resources the Soviets retain.
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