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.
We left China at the end of WW II, originally they were our ally, we left Vietnam in disgrace, we abandoned the Shah of Iran, we let Castro take over Cuba, I can go on, but our history is too allow our allies to be overrun when it’s not convenient or politically desirable at the moment to stay.