This is my last post, until September:
1. I will include union of Greece and Yugoslavia, Union of United Kingdom of Great Britain and Northern Ireland and France, based on historical facts;
2. I will include union of Finland and Estonia based on historical facts, if you agree;
3. I had never told that I will include puppet states on Balkan peninsula except Independent State of Croatia, which was the only existing souvereign state (although not internationally recognised); I added Principality of Pindus based on Crush3r's proposal, but if the nation does not comply with the standard, I will remove it;
4. Actually, that province representing Raška region is not so important. You do not need to add it. But if you wish to add it, then do not change the border of Cetinje province, but reshape the border between new province Novi Pazar and existing province Užice, so that province Užice matches approximately partisan formed 'Republic of Užice' (Ужичка република/Užička republika).