But overall, there is no way that any true communist would care for ethnic cleansing. It's entirely against their principles.
*Komuna claps* ;D
Hmm... This story is a bit confused... former SSSR rebels attacking or invading China? We know that russian pseudo-Communists never liked the Chinese pseudo-Communist methods, but why an invasion (Well... A desperate alliance? Maybe. At least sounds better.).
Now, the Chechens. Indeed, Chechenya, such as Kosovo, are not sovereign states; besides, history tells us they don't have economic or historical conditions to be independent... As Chechenya has a great muslim influence, it's very reliable to say they could join another muslim state... Therefore, simulating this conflict in 1998, this story would have several, maybe many fronts: the Muslims, the so-called "Reds", the West, etc. It would create a large scale war...
Are you sure you want to simulate it in OFP??? Not even 3.5GHz "Hyper Treading" can handle islands with more than 52Km x 52Km, and such conflit wouldn't gather islands with less than that... ;D. Unless we're talking about Hawai
However, we can still make a small conflict involving the SSSR "decayment"; for those who like that. Notice that, in 1917, the West side had really heavy influence on the Revolution. They were on the capitalist side VS the people's will, trying to save the world from the dreadfull "Communism" [Yes, I eat babies at breakfast]. In a more recent conflict, the one that gave birth to this topic (1990), we could have, once again, a very similar theatre:
Gorbachyov and his ministers mined several soviet instituitions [this is history, guys] in order to create a small and powerfull group to lead the soviet power away from the government and proceed with an aproach to the capitalist ideal. However, a better organised faction, within the CPSU structure, lead by Yetsine, took advantages from the "institucional mining" and proceeded with the destruction of the regimne... The army could only follow orders from these traitors, and so they were forced to shell the "DUMA".
Now, in your version of the story, you could put a revolucionary group of generals that wanted to avoid the killings of many citizens inside the parliament. And so they organized themselves to pull back the reaction force (lead by Yeltsine). The USA would play their role here, to assure the reaction would tryunph (as it did, according to Gorbachyov's will). And so on... until "democracy" was stablished (*cough*).