I think it's very hard that a country move part of their capital in a cryptocurrency. The world is organized with trading/financial agencies that gives a rating to your country. Which would be be the rating for Russia if they move assets in BTC / other currencies? For this reason, I think this is not suitable.
Maybe Russia's intention is to make bitcoin a recognized asset and can become a country's foreign exchange reserves, of course the very large number of bitcoin users and communities is the reason to accept bitcoin, and of course this can be used by Russia to make its citizens not worry about the economic future because Bitcoin has been accepted which is more stable than fiat during the war.