Considering the numerous restrictions on the Russian Government they are still strict measures on every transaction that is displayed on the Blockchain. Any huge amount of money moved into a wallet will be flagged and checked if it's headed to the Russian Government. And it'll be difficult for Russian Government to convert a huge Bitcoin into Fiat as well. Do you think they can get around the corner and still escape the numerous financial restriction on their country through Bitcoin or altcoin
Why would Russia convert Bitcoin into fiat, if at all they will convert them to Bitcoin to make global transaction and avoid the sanctions, but one thing is true, if there is a large amount of Bitcoin accumulation, it can be monitored and if a state or a country does that, it is easy to identify them. But in order to avoid these restrictions they will have alternative ways because they are having close ties with China and they will help them in overcoming the SWIFT blockage.