I think the main EU fear is ex-soviet countries fearing they are next if Ukraine falls. So Ukraine should not necessary win, it should mainly bleed Russia and not loose. An eternal standstill is probably best, realpolitik-wise (To be clear, I am not happy with this analysis).
True. As far as EU BigPowers are concerned, they know Ukraine has lost the war but don't really care if Ukraine is being destroyed and Ukranians are dying, as long as they kill as many Russians too.