Nothing the UN does is vital to US interests. Get out now and cut all funding
Better yet, since the UN is nothing more than a VIP lounge for dictators and tyrants, throw the bums out. Even though te UN campus is an excellent example of mid-20th century architecture, tear it all down and sell the site to Donald Trump for $1. Let him negotiate with the Mohawks and the NFL to put up a casino and stadium so we can bring the Giants and Jets back to NYC were they belong.
Not just that but kick the UN out of NY and send them some were else.
Think of all the money they would bring to Sudan if the headquarters were based there.