Iran's Foreign Minister Abbas Araghchi has dismissed US President Donald Trump's threat of sweeping economic punishment against countries supporting Tehran.

He called it a continuation of “failed policies” that would bring Washington “further defeat”, NDTV reports..

“The so-called ‘Economic D-Day’ is a diversion from America's own crisis: unprecedented debt & surging interest costs,” Araghchi said in a post on X on Thursday.

“Doubling down on failed policies will only bring further defeat -- and enmity of Iranians,” he said, adding: “US economic terrorism threatens global economy and sovereignty worldwide.”

Trump said in a post on Truth Social that he was announcing the “MOST CRUSHING ECONOMIC OPERATION EVER TAKEN AGAINST ANY COUNTRY!” and described it as “Economic Warfare and Isolation on an unprecedented scale”.

“ANY country that allows its financial institutions, businesses, airports, or government entities to provide any type of lifeline to Iran will itself face TREMENDOUS Economic Consequences,” Trump said.

War broke out between Iran and the United States on Feb 28 following US-Israeli attacks that triggered Iranian retaliation across the region.

An Apr 8 ceasefire ended the intense bombardment, but sporadic clashes continued in and around the Strait of Hormuz, a vital energy conduit that Iran has blockaded and which has since become a flashpoint in the conflict.

Reopening the strait has become a US priority, while Iran insists the waterway will remain closed until Washington lifts its naval blockade on Iranian ports, removes oil sanctions and unfreezes Iranian assets abroad.

Trump has long pursued a “maximum pressure” policy of economic sanctions against Iran and reinstated those measures after taking office in January 2025, mirroring his approach during his first term.

Iran has dismissed the sanctions programme as a failure, maintaining that such measures and threats will not force it to change course.