AFAIK Ukraine is actually managing to meet the 1:4 ratio on the battlefield, by not sacrificing their soldiers like the Russians do.
I heard that attacks on the surroundings of Kharkiv Ukraine estimated a ratio of 1:8, it was probably similar with Avdiivka and probably even higher with Bakhmut.

Ukraine is fighting against steep odds, but amazingly they are doing extremely well considering the circumstances. Probably the advantage of NOT having an insane leader.