The U.N. is more like a figurehead that consist of the U.S., Russia, China, France, and the U.K. If any one of these nations veto a proclamation, it is the end of that proclamation. Considering we have 5 nations with an unlimited veto power, it doesn't do any other nation any good.
It is good on paper, but there isn't a big force that come along with it unless you are one of those 5 nations. Just like the recent declaration of internet freedom from the UN, we already can see how our own nation is going about it (or at least, I am.)
Proclaim X, do Y.