Putin has a very 1940's approach to war - overwhelm with sheer numbers of bodies. He is learning this is 2022 however - Enemy at the Gates would have been a different movie if the Nazi's had drones.
Now that the war is extending into their "metropolitan elite" who are fleeing the country they are having something of a brain drain - if he isn't careful he will use up his peasants in his army and be left with a country where brainy people are considered to be those who can make an Angel Delight. He didn't get his Blitzkrieg victories and inside a year it's the post D-Day break out through the Falaise Gap.