The UN is doing wat it is meant to do: provide a space for nations to talk, deescalate and provide humanitarian aids. It is not and has never been to keep peace or to deter nations from waging wars. The reason why League of Nations, its predecessor, failed, was exactly becuz they tried to do that. And wat happened in the end? Germany stopped caring and Japan walked out, and nothing was prevented at all.

I mean, the best UN could do is to throw strong words at Russia, anything else like economic sanctions can be done and has been done by nations that want to already. The only thing left is a direct military intervention, which the US will not do anyway.