It is very difficult to impose any restrictions on its movement on a decentralized cryptocurrency. The article to which there is a link does not disclose how such restrictions or prohibitions will be introduced and what exactly the United States is going to do specifically for this. Perhaps they will oblige exchanges and exchangers to perform certain actions in relation to cryptocurrency funds belonging to Russian citizens.
In the current situation, when their sons, husbands and fathers, with whom Russian citizens, as a rule, have mobile communications, deliberately continue to launch rocket and bomb attacks on residential areas, schools, hospitals in Ukraine, kill Ukrainian women and children, all Russian citizens are guilty of allowing this to happen. They have to pay for everything. Even for the fact that they do not have the courage now to massively protest against the war with Ukraine.
Therefore, while Ukrainians are dying at the hands of Russian invaders, any financial and economic sanctions against absolutely all categories of Russian citizens are justified.