(lloking at map, stabs finger downward)
I'm going to keep away from the 'what is fascism' debate and try and answer the question. I do find the discussion interesting, but as a teacher sometimes I like to sit back and listen...
Anywho,
I would agree with those folks who say that you have to make sure that there are no known deposits of minerals or nothing would keep the US from barging in and screwing up your story. Thus, I think the former Soviet Republics *might* work from a geo-political standpoint as long as it isn't one that has oil deposits.
But from a game-play aspect, you want to use a country that the players know any have a vision of in their head, no? I mean, how many people in the US even know where Turkmenistan is? I would temper my concern for realism with a concern for this pre-conceived set of ideas.
I would suggest Tibet. I think China would probably veto any force from the UN, thinking that the UN would stay until the area is actually liberated. China has a permanent seat on the UN Security Council and so can do this with impunity. The Chinese record in Tibet is one that it has been fairly careful to conceal, and the Chinese government has often been slow to react to potential problems owing to closed-door arguments between different factions of its leadership.
Besides, wouldn't all those mountains be a great place for a fight? You could have the heroes duke it out on Everest or K2. I know as a player I'd get jazzed about that.
Anyway, that's just my 2 cents.