See the problem here is the areas that Russia has taken in this war.
And the idea of what about next time.
Ukrainians have to live with this prospect.
If Russia gains from this, whether it be land or political power (from fear) the incentive to do it again remains. That will always be the fear. And there is the issue of those displaced by a new border and what happens to those trapped behind that border in terms of their safety and well being.
Zelensky still has a responsibility to those people. Just 'giving them up' isn't an option either.
Especially when we have talk from Putin of effectively wanting to wipe out Ukraine and words like 'purify'.
There has to be a wholesale recognition of Ukraine's right to exist without being told what to do by Putin. Thats just not a viable idea at this stage, because Putin believes he owns Ukraine even now and that it has 'been stolen' from the greater soviet empire. And own is the correct word. Its personal and his property as leader of Russia. He doesn't believe in the concept of democracy and the right of self determination.
So the problem is that a significant barrier is trying to square the circle of one side believing in self determination whilst the other thinks this shouldn't exist and Ukrainian sovereignty is an extensional threat to Putin's authoritarian rule (if merely because Russians might decide they too deserve self determination from Ukraine's example).
These two concepts can not easily align. Zelensky might have softened language on NATO - if only in part because of being let down and needing his people to understand there's no one going to run in at the eleventh hour to save them. But Putin's really hasn't.