Yeah this war isn't ending anytime soon, and Russia has everything to gain from stalls and slow responses unless Ukraine makes some real big plays with their new toys and cripples Russia's Offensive Plans, and even then it becomes another stalemate for another few months.
I don't think EU support is going to evaporate overnight; a lot of those far right coalitions won on immigration issues and - as far as I know - supporting Ukraine remains fairly popular with the general electorate, but there's still room for the propaganda machine to churn or for Russian sympathetic political figures to drag their feet and bog up the works.
Same thing for the US, though Republicans and Trump don't really give a shit about what's actually popular and will probably axe all support for Ukraine as soon as they're able to, then just coast on being the other half of a two party system to shield them from consequences.