It would be fun watching the UN collapse.
First they’d fight over who gets to house the UN and all the wealthy diplomats it brings with a fair number of countries packing up and leaving with us.
It would be especially entertaining if they landed in the mideast where there would be weekly bombings.
No use for the Euros to fight over a new UN headquarters, they [the UN] already have four: (1) NYC [current one]; (2) Geneva, Switzerland; (3) Brussels, Belgium; and (4) Nairobi, Kenya.
Condemn the NYC HQ and give the UN six months to move out. Four weeks after the drop dead date to move out, the NYC HQ gets imploded. NYC is free to build anything on the rubble.
The U.S. does not relocate to the new UN HQ and it shuts off all funding. The UN dies of its own corruption and greed.