Trump claims Iran 'collapsing' as US threatens 'economic D-Day'

US President Donald Trump said Monday that Iran was "collapsing" as Washington prepared to announce the details of a new economic pressure campaign that Tehran has derided as an admission of defeat.

Almost six months into their war, the two sides are locked in a stalemate, with peace talks stalled, Iran keeping the key Strait of Hormuz shut and Washington persisting with a naval counter-blockade of Iran.

Under political pressure at home over the economic impacts of the conflict, Trump has pivoted away from military action to economic levers.

"IRAN IS COMPLETELY COLLAPSING!!!" the president posted in his trademark all-caps style on social media.

His remarks came hours after US Treasury Secretary Scott Bessent, in a column for the Financial Times, declared that an "economic D-Day" had begun against Tehran and warned that any country that continued to enable the Islamic republic would become a "global pariah".

Bessent also claimed on X that the US had "dismantled Iran's military capabilities, destroyed nearly 100 percent of its military factories, and buried its nuclear programme".

Iran responded with defiance, saying the latest US measures were an admission of military defeat, and warned countries against aiding Washington.

Deputy Foreign Minister Kazem Gharibabadi posted on X that the US turn to financial warfare proved Bessent's claims false.

"Your narrative doesn't add up," Gharibabadi said, asking why, if Washington had achieved its goals, "there is a need for 'the largest financial invasion in history' and the mobilisation of 'all institutions and powers' of the United States!

"Is this a victory or an admission of America's defeat?"

The US and Israel linked the launch of their war in February to Iran's nuclear programme, but the focus since the early days of fighting has been on the Strait of Hormuz, a vital route for global oil and gas supplies.

Tehran continues to blockade the strait, which it did not restrict before the war, driving up global inflation and heaping domestic pressure on Trump ahead of mid-term elections in November.

- Oil exports plunge -

Bessent was due to set out details of the US plan on Monday, but it is unclear how much more economic pressure Washington can put on Tehran.

Iran has weathered decades of crushing international sanctions, and before the war it continued to export millions of barrels of oil, mostly to China, and evade sanctions through complex international financial networks.

The US naval blockade of Iran has seen its oil exports via the Strait of Hormuz fall from two million barrels a day pre-war to just 0.4 million by mid-August, according to maritime tracker Kpler.

Bessent and Trump have both warned countries against helping Iran, signalling a shift in their focus, with the Treasury secretary's FT column dwelling on nations who "appease" and "enable" Iran.

But Iran's parliamentary speaker and chief negotiator Mohammad Bagher Ghalibaf brushed off that language, saying on X that "economically, the United States is not in a position that would allow it to further restrict its relations with other countries".

Iranian foreign ministry spokesman Esmaeil Baqaei, meanwhile, warned countries of "consequences" if they cooperated with US efforts.

For ordinary Iranians, the standoff is likely to bring only more economic pain after years of rampant inflation, which in December and January fuelled massive anti-government protests.

Sarah Hassanbeigi, a 32-year-old pharmacist in Tehran, said: "I don't think people can really take this much longer."

- Delegation from Pakistan -

Last week, Pezeshkian, considered a relative moderate, said Tehran should "bring the war to an end now as we are in a position of power".

That followed supreme leader Mojtaba Khamenei appointing hardliners to key security positions.

Hassanbeigi told AFP she wanted peace: "My personal opinion is that Iran should compromise now."

Throughout the war, diplomatic efforts, pushed on by mediators, have sought a negotiated end to the conflict.

On Monday, Pakistan's army chief Asim Munir visited Iran and met with Ghalibaf.

Islamabad was a leading mediator in talks that helped secure an April ceasefire that later fell apart.

Ghalibaf said in a statement carried by state television that Iran was "working to implement the terms of the Islamabad memorandum of understanding" that Tehran and Washington signed in June towards ending the war.

He claimed it was "the US which, by failing to uphold these commitments, has prevented the establishment of stability in the region". 

Oman's foreign minister was due in Iran on Tuesday, as Muscat and Tehran seek a deal on regulating passage through Hormuz.

bur-dcp/amj/smw