These are good points you made. Also I found this map in regards to exportsThe problem will be that whether Russia would want them or not, given that most of those countries happen to have a poor population, with some of them having no important natural resources, a leader who want to continue having their vast power and there is also the situation in this timeline’s Russia with the rise of Anti-Islam rheotoric due to the attacks there.
Also what about Transnistria? Would they wanna join?