Here's a guess based on the latest reports: Putin will huff and puff and threaten with a nuclear attack to "stop Ukraine's genocide on Russians", the few countries that are still undecided will turn against him, he will fold and withdraw from Ukraine, spin it as him "taking responsibility to avoid a third world war despite all the Western provocations", hold a bleak celebrational parade on May 9, and then forever disappear from the political scene.
Vladimir Putin is clearly ill. Even the official footage from his latest staged appearances, despite heavy editing, clearly shows him suffering from tics, tremor and tardive dyskinesia. These are not merely signs of stress, but definitely signs of physical neurological disorder, be it due to an advancing case of something like Parkinson's, or a secondary effect of medication against something else.
More than one hundred thousand people died, and Russia lost all hope of becoming a trusted international partner for trade and treaties for a long time ahead, just to prop up the last remnants of a sick and fading man's inflated ego.