It has already been a known fact that russia has been supportive of crypto since one of the major players in cryptocurrency is Russian. They are also poising to be something like a powerhouse of crypto since the west has shunned crypto and now russia and asia are the ones using the full potential of the blockchain technology.
Considering vitalik was born there and becoming a developer of ethereum from there, yes, maybe their government consider it and see that ethereum is such a huge success they are not just wasting this moment.
by accepting crypto that could mean a huge money flowing to their country and can be taxed, it's some way to add some additional country earning from crypto.