None of those cards trump a single member state whose agriculture industry is threatened by Ukraine. Ukraine already „sold” their construction contracts as a part of earlier weapons deals. Ukraine joining EU would also mean that there’s less buffer between EU and Russia, not more. Do we want to go to war because EU defence clauses are stronger than NATO ones? Plenty of countries are thinking about this too.
Western countries like Germany would enjoy another country to do a brain drain on but that’s only a handful of votes.