It's simpler then that: you currently can't trade things in and out of Russia, and can't turn rubles into other currencies: who outside of Russia wants to trade Bitcoin for Rubles?
How? Again: who internationally would want to give up Bitcoins for Rubles, when you could instead use them on literally anything else in the world. There's no expectation that Russian currency will go up in value in the near future, and definitely no expectation or even legal means to trade physical property.
I can think of several ways to do that, but they would require a very large sink or source depending on which way things go and you may very well end up holding the bag if the other parties are better at assessing risks in a very volatile situation than you are.