An economic D-Day is coming for Iran

Financial Times Europe25 Aug 2026The writer is the US sec ret ary of the Treas ury Scott Bes sent

In 1943, the Allied powers con vened the Tehran Con fer ence to plot the course of anuncharted act.

As Roosevelt and Churchill weighed a cam paign that would cul min ate in the Nor -mandy land ings, they asked them selves what could be done “to bring the greatestpres sure to bear on the enemy”.

His tory has returned that ques tion to Tehran. And the moment has arrived toanswer it with the full weight of Amer ican resolve.

Pres id ent Don ald Trump and the over whelm ing might of our mil it ary have sig ni fic -antly dis mantled Iran’s mil it ary cap ab il it ies and weakened its nuc lear pro gramme.Now we are enter ing the endgame. At dawn begins an eco nomic D-Day — the singlegreatest fin an cial offens ive ever mar shalled against an adversary.

For 47 years, the Islamic repub lic of Iran has been a malig nant force in the world.Within Iran, a cor rupt regime has con signed what would be one of the world’sstrongest eco nom ies to ruin and its enter pris ing people to repres sion.

Bey ond its bor ders, the Ira nian regime main tains a net work of prox ies that per -petu ate its ter ror. The US has paid an espe cially griev ous price but we are scarcelyalone in facing this scourge. Too often, though, we find ourselves alone in ourresolve to thwart it.

Pres id ent Trump has decim ated Iran’s eco nomy to a point where the rial has neverbeen weaker and infla tion has rarely been higher. The regime’s final refuge nowlies in the self-decep tion of fear ful nations that still believe accom mod at ing aggres -sion can secure peace.

Iran’s ena blers pur chase and trans port its pet ro leum. They facil it ate the flow of itsfin ances through exchange houses and free trade zones. They wel come Iran’s flightsand main tain regis tries on its behalf. They turn a blind eye to seaborne fuel trans -fers and the illi cit use of their banks, all while con ceal ing the extent of their com pli -city. In short, these coun tries cal cu late appease ment of the regime to be the safercourse. But they would do well to con sider the con sequences of sus tain ing it.

In the 17th cen tury, French philo sopher Blaise Pas cal gave endur ing expres sion tothe dilemma beneath this tempta tion. He under stood that uncer tainty does notabsolve men or nations of divine judg ment. In fact, it demands a more exact ingappraisal of risk and imposes a higher price for error.

Pas cal’s eponym ous wager now applies to Iran’s life lines. Nations that, in court ingreprieve from Tehran, con tinue to replen ish the very regime from which they seekpro tec tion — and now exceed the lim its of Amer ica’s tol er ance.

Pres id ent Trump is doing what his pre de cessors refused by end ing a threat theyresigned them selves to man aging. For dec ades, the polit ical class accep ted an end -less cycle of pro voca tion instead of advan cing Amer ican interests. Not another gen -er a tion should be con demned to the men ace of fan at ics who devote them selves to“death to Amer ica” and ful filling the regime’s nuc lear ambi tions. And total fin an cialisol a tion can obvi ate the need for Amer ican force while enlar ging the sphere offree dom for our allies.

Those who sever Iran’s remain ingfin an cial and com mer cial con nectiv ity will rein -vig or ate their own. They will deepen their access to global cap ital, rein force con fid -ence in their mar kets and attain the stand ing they seek in the world eco nomy.

The altern at ive for those who tether them selves to Tehran is the fore clos ure of anypath to last ing prosper ity. Illi cit fin ance will flour ish, as it so often does, where con -fid ence has col lapsed. And any nation that serves as a fin an cial artery of a with er -ing regime should expect to share in its isol a tion. To become a sanc tu ary for ter roris to become, in the eyes of the United States, a global pariah.

The Islamic repub lic has sub sisted by dress ing extor tion as secur ity guar an tees. Ithas drawn strength from a cal cu lus that regards Ira nian retali ation as cer tain andAmer ican enforce ment as nego ti able. Under Pres id ent Trump, that era is over. Andthose who fear the danger of defy ing Tehran ought not to dis count the cost of test -ing Wash ing ton.

The pres id ent has cre ated the con di tions to lever age every agency, every author ityand action many assumed we would never sum mon. Any remain ing tie to Tehranwill hasten the eco nomic ostra cism of coun tries and entit ies, whether that tie bepur pose fully con struc ted or wil fully ignored. And if, as the regime’s grasp on powercrumbles along side its eco nomy, Iran resorts to mil it ary action against US forces orits Gulf neigh bours, make no mis take: Pres id ent Trump will respond swiftly anddecis ively.

The world should under stand that our object ive is to sever every eco nomic life linethat sus tains the tyr an nical regime until Tehran stands alone. Pas- cal con sideredsal va tion to be a choice. As a great wave of Amer ican resolve comes ashore, areIran’s ena blers will ing to wager their future against it?