Trump has graduated from Putin's Puppet to Shady Vance's (?) Puppet. In other words, dementing, volatile, hypersensitive, incompetent, transactional Donald is apparently being used as a media-attracting mouthpiece whilst the actual US Badministration pulls fascistic levers behind the golden curtain.
I suspect that Xi possibly hatched the plan to induce Trump to betray Ukraine during his many meetings with Putin. Regardless, it is clear that Trump expects that sacrificing Ukraine to Putin will reap him and his offspring abundant (corrupt) financial rewards in Russia. Quite likely, Trump's childlike adulation of Putin also contributed to both his "Peace Plan" betrayals of Ukraine and his contempt for the USA's former official policy of support of Europe.
A quote appropriate to the situation: “All governments suffer a recurring problem: Power attracts pathological personalities. It is not that power corrupts but that it is magnetic to the corruptible.” ― Frank Herbert, Chapterhouse: Dune