I've seen 100-300k thrown around a lot. I think 300k got more popular recently, presumably the number will keep getting inflated as things keep getting worse. The narrative is going to be sure Russia is now taking territory and it's not a stalemate, but they're taking massive casualties so it's money well spent.

All that said, around 120k wounded is a plausible number if we go with the standard 3:1 ratio of wounded vs dead. It's hard to know how many end up seriously wounded where they're not rotated back in though. Given that Ukraine is suffering higher casualties due to their artillery disadvantage though, this gives us a hint at just how catastrophic things must be for their army at this point. Ukraine had a lower population to start with, and a lot of people fled early on. So, if Ukraine lost a significant portion of the initial army, they don't really have the people to replace that effectively. And we're starting to see western media slowly admitting this problem. I saw one article where Ukrainians were quoted saying that even if they got more weapons, they wouldn't have the troops to use them at this point.