We call there bluff
When a criminal threatens you if you call the police on them when they committed a crime, you call the police. It's not the US's fault Iran is doing criminal acts and it's up to the UN take action.
Get ready for high fuel cost.
We know that the Carter and Clinton acts of giving millions of dollars to N. Korea which was designed to stop N. Korea from continuing to build nuclear weapons resulted in N. Korea saying one thing and doing another so we don't want to fund there nuclear programs anymore.
The UN needs to get a backbone.