This is kind of an interesting situation. You are sure the Western Allies would invade Montenegro and Croatia, because it is close to Italy via the Adriatic? But it is politically complicated, because the Yugoslav monarchy is not strong there, but collaboration compromised Croatian nationalists, and Communist partisans. But you are also sure the Soviets would take Serbia and Macedonia? I mean it is far away from the water, so less convenient for the Western Allies. But the Yugoslav government in exile and Chetniks will want the west to come in. And, might the Soviet find marching southwest into Macedonia especially, but also into Serbia, sort of a diversionary direction, not headed towards Germany? On the other hand, if the Soviets are already in Bulgaria, Macedonia and Serbia are just a couple small steps further.
If the Soviets do occupy Serbia and Macedonia as you suggest, do they call it Yugoslavia, and does Tito move to meet them in their zone and take over as chief executive? Or do they call it Serbia and maybe they pick an ethnic Serbian communist to put in charge?
You think the Western Allies would do so well in western Yugoslavia they would advance into all of Austria and all of Hungary first before the Soviets get there, blocking off the Soviet advance through Romania? Or the Western Allies partially occupy Hungary, maybe everything west of the Danube, with the Soviet having everything east and north?
