But if you think realisticslly, can you see a scenario where Russia gives back the WHOLE of Ukraine, without a change of Ukrainian goverment to a "neutral" one? Isn't this a case where there will necessarily be a compromise on the part of Ukraine?

Supposedly, and some talk about this as fact, that a few months of war Zelensky was about to sign some agreement and the US supposedly came in and convinced/ordered Zelensky to not sign any agreement with Russia, to go on fighting. So the US is in a bad spot, can't abandon Ukraine now even if they wanted to, it's the US's war as much as Ukraine's.