I'm waiting for Putin to put a BTC price for oil. BTC isn't optimal for small transactions, but it is useful for exchange among peers who have no trust in a 3rd party to fairly regulate trade (e.g. Sanctions) If two nations bypassed banks with a system like BTC, then we would see what the point of BTC is.
Plus, what point does BTC have to Russia? They can’t exchange it for Fiat and no one accepts it for anything of useful value. At best It’s just an extra step between them getting their Fiat currency. He could convince other nations to use BTC, but he would be better off convincing them to use the Ruble. Nation States don’t want un-sanctionable assets - they just don’t want to be victims of those sanctions.
Even if Putin did do any of that, it just proves the SECs point. The US Government does not want people transacting with sanctioned nations and individuals. They would rather make it illegal than lose the financial power they currently have. For better or worse, governments don’t want crime (or more specifically their definition of it) to be supported by their citizens. This is why the SEC (and soon, Congress too, I’m sure) won’t stop. The existence of Cryptocurrencies are antithetical to their own existences.