For a country or government, i am little doubt about this news. Bitcoin could be a digital asset but to be government reserve, i think its too far and need more time because for government, its more safe to collect more gold than bitcoin. Bitcoin is risky assets compare gold and gold already known for centuries
Take volatility out and bitcoin becomes the best digital asset to hold but because of its volatile nature, Gold still the most reliable one temporarily. So Russia may have the plan to also hold it as asset against the future if they believe strongly in the system, but like you said, it will be bit impossible to hold it as reserve.
When it comes to something that has to do with national issue, one man cannot make such decision alone, and I am sure that In making decision to do so, a lot of members of government will surely oppose it, and until there is general regulation, countries may not fully engaged themselves with crypto.