I’d think less of Biden if he got more involved in Ukraine; I already detest him for getting involved at all (with sanctions and such). Ukraine bought off his family, not mine; let Hunter go earn his pay. The US has flexed its muscles in the past to protect its borders and still has the Monroe Doctrine; it is no accident that our neighbors are militarily weak (we provide some measure of security that makes the tradeoff worthwhile to them).
I think it was more Russia bought off the Bidens.
This explains Biden's holding up the last delivery of the weapons being sent to Ukraine by Trump. Biden's up front promise not to send American troops. Biden's green lighting of the Russian invasion when he said Putin had to do something. And Biden's weak assistance to Ukraine.
Fortunately it doesn't all depend on Biden. Boris Johnson an other NATO and European countries have come to Ukraine's aid.