If the only purpose the UN serves is the engage in 'constructive discussions' as you have put it, then it is defunct. Do you know what the League of Nations was? They did just that, sat most of the nations down and had a good ol' chat about everything that was happening. They sternly worded a reprimand at Japan after invading Manchuria and China, they scolded Mussolini for using chemical weapons in Ethiopia and in the end did
nothing at all. This was the great failure of WWI, to not prevent WWII.
If all we are doing is talking, we have already given up on acting. And if we have given up on taking action, then this is just a slippery slope into WWIII.