I think the interest grew as they knew there were tonnes of people who could invest from all over the world in global tokens or currencies. So, Russia thinks they should make a digital currency that doesn't mean anything and is worth zero, but could get millions of dollars, perhaps even billions. That's why, and nothing else, they're looking into it. Hopefully in the future all countries will accept it
What kind of investments are you talking about? After all, investments involve income in the form of dividends, but if we are talking about the digital currencies of banks and individual countries, it is obvious that these types of currencies will be stable. They will only allow expanding the functionality of fiat currencies within the digital environment in which we are all moving.