Earlier quoted context omitted.
Of course not. But I think it's also true to say if the US hasn't been willing or able to effectively use its military power at the margin to stop a historic enemy from annexing its neighbours with impunity, your average regional power doesn't have to worry about the US using its military power to dominate world trade.
Nothing will change in the US if Ukraine falls tomorrow. People love to cry foul when the US flexes it's might... then cry foul when the US takes a back seat... literally cry foul no matter what the US does. If Ukraine is so important to the world order, why has Europe (you know, Ukraine's actual neighbors) not stepped up with their full military power? Why is Europe not threatening troops, missiles, aircraft, tanks,…
If Putin wins in Ukraine, it will show everyone that the US is incapable to hold even a weak enemy such as Russia to account. It is irrelvant that you frame it as a choice rather than a failure.
Europe has been doing more than the US in absolute and relative terms to prop up Ukraine but it hasn't been enough to help Ukraine win. As a European, I would want our governments to put soldiers down and end the war, but Russia has been successful in the information war to make too many citizens afraid to enter with troops.
The US hasn't been saving the day for anyone without ulterior motives for a long time (ever?). You make it seem like it were generous moves to counter mostly Russia or e.g. ensure access to middle eastern oil.
The US has never spend money on its allies which it didn't believe has a large return. So the current Republican administration's view to reduce engagement is actually hurting themselves. Classic lose-lose.