The US will pull out of a decades-old treaty with Iran which was used by Tehran as a basis for a case at the International Court of Justice (ICJ), Secretary of State Mike Pompeo said.
Iran took the US to court after it re-imposed sanctions on the back of abandoning a nuclear deal in May.
Iran argued that decision violated the terms of the 1955 Treaty of Amity.
But after the ICJ ordered the US to ease sanctions on Wednesday, Mr Pompeo said the treaty would be terminated.
“This is a decision that is, frankly, 39 years overdue,” Mr Pompeo said.