They periodically close some account that have lesser value and represent bigger risk AML-wise. Like any bank or EMI does when pushed by their regulators. This time it seems from media that they closed some business accounts for those who traded in sanctioned goods despite goods themselves being produced in China or elsewhere. And some minor personal accounts affiliated with those companies. UAE is surprisingly well versed in finding a balance between the sides.
P.S. The whole "don't let Russians have any banking services anywhere" is an utter BS. The only thing it did was to trigger the remittance of capital back to russia and massive profits for third parties in neighbouring countries. EU and UK regulators should've instead brought good old sales of "indulgences" for anyone fleeing russia - bring everything you have, take a cut of let's say 20-30% that will be forwarded towards Ukraine support and live a happy life. Technically it would've solidified a one-way immigration, because supporting Ukraine financially is a crime in russia these days, so new immigrants would've been afraid of deportation and behave.
