Viewed from the outside, Putin’s war has been a massive strategic failure. Russia has suffered hundreds of thousands of casualties, while taking relatively little ground; NATO has expanded along its border; it is now effectively a Chinese client state; its best and brightest have left the country; its Syrian satellite has been lost; and its economy is feeling some strain. From Putin’s perspective, however, the war has been a success, because it enabled him to dispense with any remaining liberal democratic niceties and govern directly as a fascist. That’s a big win.
With that as background, why would he agree to end the war? Expect him to deal with cease-fire proposals the way Lucy did with Charlie Brown and the football; he’ll sort of agree but insist on conditions that are clearly unacceptable to the Ukrainians with the expectation that Trump will either give in to him or that he will gain more ground while he prolongs the negotiations.