[1] This is my understanding. If someone knows better, please post. One source that goes into some detail about the current situation is: https://www.washingtonpost.com/business/energy/how-war-and-s...
>The Bank of Russia more than doubled the benchmark interest rate to 20%, a 19-year high, on Feb. 28 and also imposed capital controls, including a ban on foreigners’ selling of securities. Nabiullina said decisions to suspend some regulatory requirements amounted to a capital boost for banks equivalent to 900 billion rubles ($8.7 billion). Putin banned all Russian residents from transferring foreign currency abroad, hardening capital controls.
[1] https://www.reuters.com/business/finance/russian-central-ban...
This is completely irrelevant if you can't sell it for USD.
Lithuania has apparently already done that.
https://www.dailymail.co.uk/news/article-10797707/Russian-br...