Well they wouldn't have to conquer the whole of Siberia. Just conquer Vladivotstok and destroy the Trans Siberian Railway and the Russians couldn't transfer troops and supplies.

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Germany would of won the war if he had moved on his advice from his genrals and not split the 5th and the 6th army (i think) and moved straight to moscow. but he waited against all of his genrals advice and moved the 5th army south to capture the oil fields.
so in my opinion hitler's worst enemy was him self and as stalin learnt early in the war to listen to his genrals hitler found out much to late that politacly he was a genius but as a genral he was useless and if the assasination atempt has worked i think nazi germany would he gone a lot better in the war.

In July 1944 the war for Germany was almost lost. They could have tried to make a good peace, but big victories would be very difficult, no to say impossible.

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