In a war time like this, there is bound to be sanctions from world powerful Nations even US and her allies. There has been similar sanctions untill the US and the Allies looked at cryptocurrency as a possible escape route for the imposed sanctions.
Now to make these sanctions more effective, the US decided to engage the cryptocurrency sectors by complying to the blockages of all Russian crypto related crypto transactions. To this effect, all major exchanges has been complying, and the likes of Coinbase, Binance are in the forefront to current scenario.