My immediate reaction would say the Ukrainians(as I would favor the Hungarians in 1956 and the Czechs in 1968 in similar situations against the Russians). But I think I need to be better educated about the dynamics, politics and history of all sides in this scenario before I fully endorse them.
After the USSR was dissolved, some countries made it happen, some muddled along, and some reverted. Hope that doesn't complicate anything. :)