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.
These are wrong arguments, and I'd say a little naive.
Because at bigger level where governments are involved, if any of them wanted to send money to Russian government, nobody could prevent it. So they don't need bitcoin or any other cryptocurrency. In fact the Russian allies, or countries with shared interest, like China don't care about these things and will keep their relationship and trades through the financial channels they open up way before this conflict began.
Bitcoin will remain as it has ever been, for people to regain their financial sovereignty. Whether it is in Russia, Ukraine or anywhere else.
The sanctions are also not targeting the government, despite what they may tell you. They target regular people. For example when the airspace was closed to Russian and Russia reciprocated, it is now Europeans who can no longer travel since the main route to a lot of east Asia was shut down and the alternative routes cost a ton more that neither the airlines nor people can afford to pay.