The fact is, Trump will enter his presidency with the least leverage possible over Ukraine. Ukraine has enough money to fund all of 2025 and part of 2026. They have enough weapons and ammo to last most of 2025, and with aid from other nations (plus that money) they will be able to fight through 2025 without issue.
Trump will have little leverage over Ukraine. But much more leverage over Russia. Particularly with sanctions. And while Ukraine does have the money and weapons to fight in 2025, they could always use more.
People fearing Trump will be able to crush Ukraine in 2025 I think are barking up the wrong tree. There is very little, if anything, Trump can do to force Ukraine to stop fighting. And as time goes on, the US will become increasingly less relevant to Ukraine and to Europe as a whole.
In essence, the nation that is most likely to lose from Trump is the United States, if the US, for baffling reasons, were to side with Russia. Or, the US could maintain its standing by siding with Ukraine. Either way, Ukraine can fight on with or without US aid.