I believe a big crux is in definition of "war ended".
You (and Donald Trump) seem to be using "Ukraine and Russia stop shooting at each other right now", while Ukraine operates more under "Russia stops shooting at us for the foreseeable future, 20 years at least." Russia has previously broken a number of ceasefires and written agreements (including the infamous Budapest memorandum) and so Ukraine is not super trusting to agreements not backed by anything.
What Ukraine will accept is entirely dependent on how much funding they will get from foreign powers to continue their war effort.
I've had a lot of responses to my comment, yet I've seen no alternative ideas presented that will result in a different outcome. What is your plan for getting Russia to lose this war?
You (and Donald Trump) seem to be using "Ukraine and Russia stop shooting at each other right now", while Ukraine operates more under "Russia stops shooting at us for the foreseeable future, 20 years at least." Russia has previously broken a number of ceasefires and written agreements (including the infamous Budapest memorandum) and so Ukraine is not super trusting to agreements not backed by anything.