The Russian miners would either stop mining altogether or continue to mine on their own minority chain.
Mining would be impossible since their hashrate percentage is rather small. But it's different case if someone propose hard fork which add Emergency Difficulty Adjustment (EDA).
What is far more likely is that there would still be a handful of nodes which could still communicate to both sides of the divide, and so the whole network would stay in sync.
I agree, i expect there are few brave people who risk using satellite internet (which is harder to be blocked/controlled).