(a) trade with other EU partners that depend on Ukrainian food imports, gas transshipments, etc., and also on those trade partners. y'know, not being embroiled in trench war on their eastern front.
(b) trade with APAC partners that depends on EU partners that depends on (a). Even the most blatantly obvious ASML -> TSMC -> NVDA -> FAANGetc relationship transits that entire chain.
(c) the entire web of mutually beneficial international trade that benefits from (1) a more or less stable system of borders and laws and (2) again, participants in said system burning the minimum amount of blood and treasure trenches.
So what is it you really think? US involvement is unnecessary to maintain both its current position and the rest of the international system? Or that system unnecessary to maintain the state of the world today, and some alternative arrangement would be preferable? And we can smoothly transition to your preferred system with a belligerent Russia?
I'm being a bit unfair in the preceding paragraph, so I'll ask in all sincerity: what's your alternative policy in 2014? 2022? now? what outcomes do you predict under your policy? Who is (dis)advantaged?