At this point Putin’s goal is pure personal survival. He needs to not lose the war because that would make him look weak, which is very dangerous for a dictator. To keep himself alive and in power he is willing to throw any amount of Russian soldiers into the meat grinder.
Putin thought he could defeat Ukraine in three days, and the result is two years and plus of war, tens of thousands of casualties that he will admit to, and US-made weapons now being fired into Russia. I don’t see him being the kind of 4D Chessmaster you seem to think he is.