You can either win or lose a war! War is a disease, and disease can be either cured or lost to disease.
Accordingly, in this case, Ukraine must end the war, inflicting losses on Russia that Russia cannot bear. It will not be able to endure in terms of the destruction of army structures / units, the economy, the social situation in the country. When will it happen? It's hard to say, Ukraine is disproportionately smaller than Russia, so we need help from other countries, at least in arms, ammunition, economic and political pressure on the aggressor country. Therefore, the end of the war is a complex process, depending on many world players and their desire to participate in these processes!
It "sort of" is like that. I mean obviously it doesn't stop that way, but just look at what the USA did in Afghanistan, they didn't maybe push a button and suddenly stopped, but they just ... left and that was it. Same could happen to Russia and Ukraine war.
All Russia has to do is take the two pieces of land they occupied and wanted to do that to begin with, and leave the rest, put all soldiers there, and do not attack anyone. If they do that, I am 99% sure that along with crimea, they will be given those two new lands, and nobody will attack them and they won't attack anyone and the world will go on like nothing happened. There will be hatred there, but the war will end.