Ukraine claims north of 400k, which is undoubtedly optimistic, but allied intelligence agencies have previously floated numbers around 1/2 to 2/3rds of Ukraine’s public claims, which is still an utterly appalling number of dead Russian men. Russia’s tactical approach from the start has been more or less to treat their mobilized conscripts as expendable. For politically-important objectives their commanders have been perfectly happy to dump fresh meat into the metaphorical meat grinder until the gears jam, and then claim victory.