What is really the difference between their crypto currency and their fiat? At the end of the day, they still control it which is counter to the decentralized system. So what that, in theory, they cant expand it at will (although on ETH they basically can).
The entire point of crypto is that nobody controls it...and the more these countries try, the worse they fail.
Would you by the russian token or LTC/BTC/DASH or whatever coin?
Why do people use their fiat currency? If those same conditions exist for their cryptocurrency then people will just switch and use that. So it really comes down to what do I need to use in order to get the things I need. So at that point you need critical mass of things being made available via a cryptocurrency (or any currency) that they don't control.