He would if the terms he demanded for it were those that both parties of the conflict had already ruled out.
Trump's team has acknowledged NATO is not viable and Russia categorically will not accept Ukraine in NATO. This conflict started over eastward NATO expansion, one of the primary, if not the most primary goals of Russia in their fight is to stop Ukraine from becoming part of NATO and stationing western weapons/troops there near them.
Russia is winning and the support of the US is waning. They are not going to accept having spent all that treasure and blood and taken all these sanctions and in the end not get their primary goal just to get Zelensky to step down for another person who hates Russia.
It's not going to happen anyway, Ukraine can't join NATO while they're a Russian forces in the country, as that immediately triggers article 5 which is obviously not something NATO want to happen.
For me to point out that somebody from an ML instance is an idiot but like can you be even slightly less mind numbingly stupid
Funny time to do it, once he's lost the war, had Ukrainians kidnapped straight onto the frontlines, and once negotiations are taking place without him (which might end with him in front of a jury). Not to mention member states have already taken it off the table which means "I'm not going at all". Might as well have said his only demand is to marry the tooth fairy.
But sure, y'all just keep fetishizing yet another western puppet who called off elections but did it "for the right reasons."
"Valid" as in feasible? No. The war was started to keep Ukraine out of NATO, and Ukraine wasn't fully backed by NATO in the war because it isn't willing to go to war with Russia just for Ukraine.
I'm not an expert, but have read a decent amount on this. Others may have more and better info.
With that said, even if an Article 5 invocation won't bring the US into your fight, it provides a hefty infrastructure of value to countries in it. From basing, to logistics, to intelligence, to aid, it is valuable. Now the politics of it are complicated and the US can hinder some of that value, but it still means that in Europe if Russia provides an Article 5 reason, other countries in NATO can choose to help in various forms. That's not nothing. It's also faster and less arduous then negotiating individual defense treaties with neighbors and others.
So yes, overall probably still worth it. Even if just as an entree into other alliances.