We are speaking of decisional power.
If most European countries want peace, why should the US do anything to make the Ukrainian war continue ad infinitum?
Does Europe's stance matter?
I think the US should intervene only by Invitation of which Ukraine essentially set out a distress signal when the Russian invasion commenced with the backing of course from the American people through their representatives.
I'd say European countries most certainly has a role to play, being that the invasion is far closer to their Homeland than we are in the states.
Personally I view it as being a European problem exclusively , but then again World War II was an exclusive European problem and America didn't intervene until much much later.
As far as I can tell both Europe and North America are proactively involved through logistical support and has remained since the Russian invasion have begun so the justifications revolve around making decisions as to whether Ukraine needs or requires continued support or talking to the Russians to help cease hostilities by discussing concessions.
I can't tell at this point what would actually be better or worse across the proverbial pond.