Good luck sorting everything out, especially due to PF's pact + war with China, LC's loss of European HQ, Euro Alliance on the run + counterattack against Epsilon and the rise of the Foehn Revolt...
Political map in RA2 is updated with each mission. Same can be done with MO either officially or unofficially. If we want to make it simple, there may be made maps which only show start of act 1, end of act 1, start of act 2 and end of act 2.
I like this idea, it would be the most realistic approach
At the same time though, I think that a map that updates mission by mission would be quite interesting because it would show how rapid and overwhelming the Soviets' victory was. Then maybe we can have one of those slideshows that animate the war's progress.