US is buying russia’s defeat and demiliterisation on the cheap.
EU and US are not always on the same page but on this they are.
Starting shit in Europe is very personal and very symbolic to western nations as well having the massive precedent of WW2.
Cold war is great for stable economic MIC growth. Actual war is the opposite especially when other goods and trade is harmed causing inflation and all other economic shenanigans that one would want to avoid outright or from escalating.
Ukraine and other eastern Europe countries now looking to seek protection of nato with which there are mutliple requirements and conditions for said joining and few of which are core liberal democractic based.
Its never one thing. Politics is like a never ending game of dominoes where pieces fall and right themselves anywhere and everywhere