1: Hitler was obsessed with taking down Russia, war with Russia was inevitable as long as he held power.

2: A lot of Jews would have died, Germany would have been able to take down Russia, Germany would have possibly attacked the West afterwards or exspanded further to the East.

3: Russia=Dead Germany=Not quite dead, but likely would have lost.

4: If they beat Russia before they developed the bomb Russia would have fallen, Air Superiority and such would have been their downfall. Russia=Depopulated and non-communist.