Russian capital flight
It is unclear why the Kremlin and its masters are Putin the boot in to crypto. Pundits have suggested read-only techno-rubles could be an instrument that might help Moscow evade the many sanctions imposed because of its illegal invasion of Ukraine.
Russia is suffering from tremendous 'capital flight' at the moment as Russians with some money try to get their Rubles out of the country and into Dollars or Euros. Moscow is actively pursuing capital controls to stem this.
Cryptocurrencies work quite well for shifting large amounts across borders if legal routes are limited. I suspect the Kremlin decided that the downside of capital flight is greater than the upside of sanction busting. They could be right.