Ukrainians claim big Russian losses, minimal Ukrainian military losses, but big civilian losses.
Russians claim minimal Russian military losses, big Ukrainian military losses, minimal Ukrainian civilian losses.
Russia doesn’t claim any of its losses at all. The UN claims about 3000 civilian casualties, most in Donbas, presumably by Ukrainian artillery. There are rumors of 20,000+ Ukrainian KIA, said to be from the Ukrainian internal sources whereas the real numbers are about by 50% higher. There is an increasing number of Ukrainian POWs approaching 8,000. Russian and combined allied losses are believed 3-5,000, mostly within the LDNR militia.