>Self-determination and agency is only available to those who have the means to fight for it. Ukraine has none, it has whatever the nations providing 10s of billions in military aid allow it to have.
Fascinating claim about a country that has been successfully resisting a Russian invasion for 3 months with predominantly locally-produced (and upgraded) weapons.
Nevertheless, if we steelman your argument and agree that Ukraine can never be truly self-determined and that it must choose between US or Russia, then not choosing a country that has done to Ukraine what the Russian Federation has been doing at least since 2003[1] seems favorable.
There's also the matter of centuries worth of historic memory of repression and subjugation, tortures, rapes, murders, man-made famines, forced mass deportations, etc. perpetrated by Russian autocrats and dictators. And now, quite alarmingly, we are seeing Stalinist-style atrocities being committed in 2022[2,3]. With this in mind, falling under Russian occupation is the worst case scenario for Ukraine and Ukrainians.
1 - https://en.wikipedia.org/wiki/2003_Tuzla_Island_conflict
2 - https://en.wikipedia.org/wiki/Russian_filtration_camps
3 - https://en.wikipedia.org/wiki/Bucha_massacre