Americans have no interests in the Ukraine and we cannot save them without significant cost so yes I would leave them to their fate which would likely have been better had we not decided to enter this proxy war.
The only excuse you have for kicking this hornets nest is “moral superiority” and eventually the bill will come due. My hope is that me and mine don’t get killed so you can feel righteous.
Stability in Europe is in the US interest and the money we sending to Ukraine is pocket change. We should have given the Ukrainians the resources they needed from the start.