Trump has been in bed with Putin and Russia for a long time.
He was even impeached for it, but the United States legal system failed to do anything about it or Trump's other bazillion crimes, and American voters are the biggest fools on the planet and gave him power again.
Trump has been championing "peace deals" between Russia and Ukraine throughout his second term periodically and they all involve capitulating to Putin and the United States sucking off the teat of Ukraine's resources.
The reason is money and power. Trump and his team of fascists the world over want to control everything that there is and people like Zelenskyy and the innocent people of Ukraine present an obstacle in that they have been incredibly persistent in standing up against aggression.
Trump and his team have been happy turning the United States into a mafioso oligarchy similar to that of Russia and Putin is therefor a natural ally and has taught them a lot on how to manipulate political systems, media, and populations, and create a system of fear and control.
I have no doubt there is a plethora of corruption, blackmail, and a litany of moral and legal fuckery going on between the oligarchs of Russia and the oligarchs of the United States on a daily basis.
Seems to me Trump's "peace deal" is a pathway for the US and Russia to split the wealth of Ukraine, disrupt NATO's ability to defend Europe, and warn others not to stand up to fascism as the new world order.