Trump claims he will "end the war on day 1" and "it will be so easy" and the reason it wasn't ended in one day is because "Biden is stupid" but Trump is so smart and Putin likes him and will listen to him.
Well, Trump has already spoken to Putin. Why isn't the war over?
The war was started unilaterally, by Putin. Trump doesn't need to convince Zelensky to end the war. There is no deal to be made with Zelensky. There is only a negotiation with Russia to stop or Russia needs to be afraid of the consequences if they don't stop. But Trump has shown Russia who's side he is on and that there will be no consequences for Russia to continue.
Trump plays a game where heads I win, tails you lose. No matter the outcome, he will claim it is what he wanted and that it proves he was right. He doesn't stick to a position because he has no position. He simply wants to be perceived as a winner and a dealmaker. The substance of the deal is irrelevant. And sadly, most of his followers don't care about the substance either and blindly follow the conman where he leads them.