I don’t think so. Ukraine has been gearing up its domestic arms industry all war long. They may suffer a big setback if the US withdraws all support but I think Europe has shown a lot of indications that they will step up. Ukraine is digging in for the long war.

I also think it’s possible that Trump may get impatient with Putin if he’s unwilling to compromise (and all indications are that he will). Furthermore, the domestic problems that drove Putin to invade in the first place have not gone away. If anything, they’re worse than ever. If Russia finds itself without a war then domestic disputes between different factions will begin to heat up again.

While bitch boy America is set to bend over for the aggressor, NATO and EU have made efforts to trump proof the support. Also Trump is too stupid to work against things methodically, he is a tool for evil for sure but he isnt exactly productive - couldnt even gut healthcare when he held all the power. He can stop the US support but other than that he can't really do kuch to encourage others to.

Also I just voted in Ireland and left Sinn Fein off my ballot for calling for the US to stop arms support to Ukraine.