Ukraine loses their best troops too on the counter attack whilst Russia just loses scumbags released from prison that aren't expected to survive 6 months (when their unconditional discharge kicks in).
What does a Ukrainian win look like?
Whilst losing territory would be very frustrating, if the outcome was the Ukrainian lands that remained were given entry to NATO and a fast track entry to the EU, I'd call that a huge win.
If that was combined with pre Feb 2022 boundaries or even pre 2014 boundaries that would be incredible but may only be possible if Russia collapses or the Russian army collapses in spectacular fashion. If neither are likely any time soon, would winning the peace (NATO and EU) be better than winning the war but at an even greater loss of life?
Winning the peace in an unsatisfying Korean style armistice isn't a total victory but it's a win that has sustainability as it prevents any further Russian escalation.