At this point I'm afraid Putin will escalate this war up to the point before nuclear weapons, in an attempt to hasten Ukraine's downfall.
Western nations are already doing everything they can to damage Russia. The sactions and cost of waging the war will escalate as this crisis continues, which means it's not in Putin's interest to prolong this war.
Putin will have to quash unrest at home as well, which means martial law, more crackdown on liberties, and ultimately more suffering for the Russian people.
Also shoutout to the Belarusian people who are taken hostage by their own dictator figure Lukashenko, alienating themselves from the world and suffering as a result.