US threatens Iran with 'economic D-Day' as markets await sanctions announcement
US Treasury Secretary Scott Bessent has announced the launch of what he calls an 'economic D-Day' against Iran, describing the campaign as the single greatest financial offensive ever directed at an adversary, with further details due later on Monday.
Published on 24/08/2026 - 11:00 GMT+2
The US is ramping up its economic pressure on Iran after Treasury Secretary Scott Bessent declared the start of an "economic D-Day".
According to Bessent, this represents "the single greatest financial offensive ever marshalled against an adversary." He set out the position in a post on X late on Sunday and in a Financial Times opinion article published the same day.
Bessent stated that US President Donald Trump's military campaign had "significantly dismantled Iran’s military capabilities and weakened its nuclear programme". He added that the administration is now "entering the endgame" and that the economic measures begin at dawn.
The objective, according to the US Treasury Secretary, is to "sever every economic lifeline that sustains the tyrannical regime until Tehran stands alone".
Bessent cautioned countries that continue to buy or transport Iranian petroleum, facilitate financial flows through exchange houses and free trade zones, handle flights, maintain ship registries or enable seaborne fuel transfers, that any remaining links would accelerate their own isolation.
The comments follow remarks by US President Donald Trump last week. At the time, Trump announced in a Truth Social post "the most crushing economic operation ever taken agaisnt any country!"
Despite both declarations, specific measures have not yet been set out.
According to Bessent's outline, the package could centre on secondary sanctions against nations and entities that keep purchasing Iranian oil, process its finances, operate related banks or support shipping and other commercial channels, layered on top of the existing naval blockade.
Bessent is scheduled to hold a press conference at 7 PM CET on Monday to announce the concrete steps.
Market reaction
Oil prices are lower on Monday morning even as the rhetoric intensifies.
At the time of writing, Brent crude, the international standard, is trading at around $91.5 which is 2% lower than Friday's close while West Texas Intermediate stands at roughly $86.2, about 1.5% lower than last week's close.
The fall may stem from profit-taking after recent gains and from reports of a temporary rise in tanker movements through the Strait of Hormuz.
According to shipping information cited by Axios, around 40 tankers transited the southern channel on Friday night, moving roughly 16 million barrels of oil, higher than the 15-20 vessels recorded on preceding nights.
Overall volumes through the waterway remain well below pre-conflict levels.
On the other hand, US futures are also in the red ahead of market open while European stocks are trading flat.
