Russia? I'm not sure Russia has been crypto friendly. Those guys have been an attack vector to Bitcoin and don't like anything crypto unless there is a change about there government and views on Bitcoin. That aside, only US has been shouting about reserve and their plans for crypto. I can't affirm if this will be possible but if they which is conditional, if they do trust me other countries will follow later but for now, it's just formal talks and we can't rely on that alone.

El Salvador legal tender is there but the people didn't use Bitcoin as many expected, the free Bitcoin that was airdrop to them sold everything but perhaps if US start their promises about Bitcoin there is going to be a huge demand in Bitcoin as exchange for people that really want to accept but people that are not used to it and used to traditional currencies will find it hard to accept it because of the volatility they may face if they accept it from customers.