UNITED STATES President Donald Trump ordered a halt to all talks with Iran and vowed “economic warfare” against any country that helps Tehran

Mr Trump told his negotiating team, including Vice-President JD Vance and envoys Steve Witkoff and Jared Kushner, not to engage with Tehran despite what officials described as some “positive discussions” with Iran, according to a report by CNN.

In a social media post on Wednesday, Mr Trump said the Iranians had “failed to take” the opportunity to reach a deal and would now face “economic warfare and isolation on an unprecedented scale.”

He warned that “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,

“Oil smuggling, swap lines, cash transfers, exchange houses, ship registries, front companies — it all needs to stop now.”

The US president added: “You know who you are. This will be an economic D-Day and we need all of our Allies to stand with the US to isolate, and defeat, the Iran threat.”

This is not the first time that Mr Trump has threatened to ramp up economic pressure on the Iranians.

His administration has been waging an economic pressure campaign, labelled Operation Economic Fury, since it and Israel launched their illegal and unprovoked attack on Iran on February 28.

The US has already imposed sweeping sanctions on Iran’s oil, shipping and financial sectors.

It has also imposed a naval blockade on Iranian ports and targeted companies, brokers and tankers accused of helping Iran sell its oil abroad.

Iranian Foreign Minister, Abbas Araghchi, dismissed Mr Trump’s latest threats, calling it a “diversion from America’s own crisis: unprecedented debt and surging interest costs.”

Posting to social media Mr Araghchi said: “Doubling down on failed policies will only bring further defeat — and enmity of Iranians.

“US economic terrorism threatens the global economy and sovereignty worldwide.”

The Tasnim news agency dismissed the announcement as nothing new.

Tasnim said the US “has been trying for years to block any financial and economic ties with Iran” but that Tehran has “learned how to circumvent these restrictions and has become very skilled at doing so.”

The Fars news agency dismissed Mr Trump’s threats as “delusional.”

Mr Trump’s announcement came hours after the United Arab Emirates suspended all financial ties with Iran, accusing it of launching two ballistic missiles towards its waters.

Tehran denied the claim, and dismissed the incident as a “false-flag operation.”