It’s not just Ukraine, how do you think the Afghani’s who backed the USA as interpreters feel after Biden abandoned them.
The USA has a long history of supporting countries in a war and then abandoning them in the end and leave them to the mercy of the other side.
We shouldn't have left Afghanistan and let the Taliban takeover. But, that is on Biden.
We should never have meddled in Ukraine and fomented an illegal coup that setoff a civil war.