I do not think that Russia will be able to avoid international sanctions with the help of cryptocurrency. Cryptocurrency as a means of payment should be exchanged in this case for any groups of goods. And it is impossible to move them in large volumes imperceptibly from one state to another. As a means of paying off debts and even settling trade transactions, cryptocurrencies are not so popular that the other party agrees to accept them.
Inside Russia itself, the situation here is not in favor of cryptocurrency. The Russian government has now banned even issuing currency to its citizens and taking it out of the country. Settlements within the country only in rubles. True, now deposits have already begun to be opened in Chinese yuan. To avoid the flight of capital abroad in Russia, it is unlikely that the free circulation of cryptocurrency will be allowed.