Re: roll their tanks 4500 miles across rugged, mostly unpopulated Siberia,
You missed the context, old boy.
The Russians had these things called Intercontinental Ballistic Missiles that they threatened to spray all over Europe when The Big One went down. We all thought that it would just be easier for the belligerents to point their rockets in a polar trajectory and get stuck in without involving the rest of us.
The question being answered was "Why don't the people we install our service bases amongst like us?" and I was responding to that, not to a comprehensive plan to re-configure the Soviet land Forces in East Germany.
Do keep up.