Trump's disinclination to war is that he feels like the US ends up fighting other peoples' wars, and spending its money on them, which he thinks is for chumps. It's certainly not his deep concern for greater humanity, as he has none. All of his motivations are transactional...'what does it do for me?'
He also has no skill at, nor care for diplomacy. His approach to peace in Ukraine is based on completely rewriting history, and so, a lie. ("Zelenskyy is a dictator; Ukraine started the war.") He's reversing decades of US policy towards Russia as a non-democratic regime, betraying our interests and our allies.
@Federberg has rightly expressed a lot of anxiety over the fate of NATO given Trump's policies. What he wants out of this negotiation is to fulfill a brag he made about it the electorate, to keep Ukraine out of NATO and further hobble it, and to suck up to his friend the dictator, Putin. I don't know why you would treat this like some normal negotiation, since it never has been. And I'm very curious to know who you think Putin answers to back home.
Trump promised an end to the war in a day. He can't even get a proper cease-fire. Personally, I'm still curious to know how Trump reacts to Putin making this a pissing contest.