Thats a great news for sure. Russia is a very big country with crowded population so the number of investors are great there. If that happens it can effect even the worst coin in good way so i cant even imagine what will happen to ethereum.
The number of investors in Russia are about 100 000. That many people have stock shares. Even 1 or 2. Others have nothing. Is this number great or not very - i don't know.
That is a bigger event coming for the crypto users as the users of Russia are considered as a higher amount of population and when the state will announce its legitimacy then it will be announced all over the country and then at that time more and more people from that country will invest their money in bitcoin and as with that the price of bitcoin will increase so people from all parts of the world will also put their money in bitcoin.
They could invest their money into cryptocurrences if they had some. But they have not. Generally it a very poor country nowdays. Twice more poor then Estonia for example.