You are aware that Trump has _not_ stopped this war right? He has floated certain some possible agreements with Ukraine, but his terms have not been agreeable to the Ukrainians. If Trump actually wants Ukraine to come to an agreement with the US, he'll have to come up with a deal that is acceptable to them.

So yeah up until now Trump has done _nothing_ to stop this war. He's really only proved to all the US' supposed allies, that the US is not trustworthy. At this point, Trump should just shut up and stop pretending like he's trying to reach some peace agreement. He should just stop sending funds to Ukraine as he obviously wants to do and just leave the discussion because he's really no longer relevant.