It would be nice if he would do that. He might do it if Ukraine agreed to give up Crimea.
One possible negotiating strategy might be for Ukraine to agree to negotiate rental of some parts of Ukraine ports for peaceful business shipping purposes. Carefully monitored so military shipments are not being hidden. Russia’s grain for example. A warm water port has been a Russian goal for centuries. Negotiated port use might give Putin a small claim to a Russian “victory” on a long held goal. A goal I am sure Russians learn about in school. Oh, and maybe let the Kerch Bridge be named the Putin Peace Bridge, and allow Russian tourists to enjoy Crimean beaches, once all the theft and expropriation of Ukrainian owners Crimea property has been sorted out.