What does surprise me is that those restive regions haven't yet twigged that the game is up and begun taking matters into their own hands.
Two things to start with.
Nobody wants to be first whilst the others wait to see how Russia responds.
Most of their leaderships depend on Russian support to stay in power - kick out the Russians and you’ll probably quickly follow them out the door.
Hence any move would probably follow a coup by a group claiming national support.