Dubai already has its own cryptocurrency from what I know. It's not a country, but I'd still call that one the first.

And while I am inclined to distrust government controlled cryptocurrencies, I'd trust even less this CryptoRuble.
I mean, come on, Putin was just a couple of days ago against Bitcoin, calling for ban of all cryptos in Russia. And now he has his own crypto? How long until he changes his mind again? What if you invested your money into it and he decides to halt this project just because he changed his mind?