Russian unemployment of 2.2% is a bad sign, not a good sign.

For practical purposes, unemployment around 4% means full employment, because there's always a portion of the population not working for some reason: taking time off, too dumb, don't want to work, unable to for reasons of temperment or psychological health, etc. At 4% (as the US has often been in the last few decades) it's really difficult to fill menial roles or unskilled factory jobs with people who know their ass from a hole in the ground.

Russia at 2.2% means many needed positions are going unfulfilled, crippling productivity and planning. It's a sign that the manpower needs of the war are draining productive workers, slowing their own economy at a time when they need more productivity to overcome sanctions and other economic effects.