The problem gets worse the more both sides add to it! The more cluster bombs and depleted uranium rounds are used, the more uninhabitable Ukraine will become.
Also, I’m not finding evidence Russia was using DU rounds before this - cluster bombs, yes, but not DU rounds. They definitely could have been, their tanks are capable of it, but the news media never mentioned it as far as I could find. That’ll change now that Ukraine is using them, though.
You act like Ukraine is acting independently and making its own decisions. The reality is that any decisions Ukraine makes are heavily influenced by the NATO alliance backing the war effort. There’s a point when you have to wonder how much pressure is being put on them to destroy their own country.
I bet we’ll find out in 10-20 years that they were forced to do this to themselves.