Such as ?
Do you know what happens to the rest of the world if the US economy tanks?
"Do you know what happens to the rest of the world if the US economy tanks?"
Excellent question. And that is the only non-lethal leverage we have over the UN at the moment. But if we were to suddenly cut off funding completely, the UN would call on world wide sanctions, seizure of assets in foreign banks, seizure of businesses, arrests of US citizens overseas, etc. It's an economic doomsday concept. Just the fear of such draconian moves would cause stocks to plummet and our currency to spiral down at a fearful rate.
However, the UN's credibility is in freefall. So we can choke off some of the funding now-and-then. Slowly fading is not nearly as terrifying to the UN. Painfully frustrating to us, but not as dangerous, IMHO.