US Sanctions Iran's Shipping, Oil and Gold Links as Tehran Threatens to Seize Ships in Hormuz

Treasury Secretary Scott Bessent announced a sustained sanctions campaign against Iran on Monday, extending secondary sanctions to shipping, digital assets, gold, aviation and technology and warning foreign firms and governments to cut commercial ties with Tehran. The Treasury Department designated close to 60 entities, individuals and vessels tied to oil smuggling, nuclear and missile procurement and cyber operations, the Washington Post reported. Bessent said the objective was "to sever every economic lifeline that sustains this tyrannical regime until Tehran stands alone," according to NPR, and told reporters that China would not be exempt. Oil fell rather than rose on the announcement. Brent crude dropped 2.5 percent to $92.06 a barrel, CNBC reported, a signal that traders had already priced the measures in.

Iran answered at the chokepoint rather than in the financial system. The Persian Gulf Strait Authority (PGSA), the Iranian body created in May to regulate transit through the Strait of Hormuz, published a list of 46 vessels registered across 17 flag states and warned that ships breaching its transit rules could face "fines, seizure, or confiscation" on future passages, Argus reported. Twenty-one of the listed ships fly the Liberian flag, and the authority said any vessel conducting ship-to-ship transfers with a listed ship would itself be added, per Newsweek. The Office of Foreign Assets Control (OFAC) sanctioned the PGSA in May. Foreign Minister Abbas Araghchi had dismissed the American measures in advance as a repeat of what Iran has already faced, Al Jazeera reported.

That is why the insurance question now matters more than the sanctions list. Saudi Arabia is in talks over a state-backed war insurance scheme after commercial insurers raised prices or withdrew cover for ships and companies operating in the Gulf, the Financial Times reports. Indicative war-risk premiums rose to about 0.75 percent of a vessel's value from around 0.3 percent after Yemen's Houthi movement declared a naval blockade of Saudi Arabia in late July, according to Insurance Journal, and premiums for some southern Red Sea voyages passed 1 percent. On a seven-day voyage, that difference amounts to hundreds of thousands of dollars per ship. A published seizure list adds a second layer of cost on top.

Separately, Prime Minister Benjamin Netanyahu said in a phone interview broadcast by Israel's Channel 14 that Iran had tried to kill one of his sons. He did not say which son and offered no public evidence, and the Times of Israel reported that Israel's military censor had barred publication of the alleged plot for months. Iran has not responded to the claim.

The pattern across all three developments is the same. Washington is squeezing Iran's revenue, Tehran is answering by raising the physical cost of moving cargo through the strait, and the difference is landing on insurers and, increasingly, on states. When a government offers the backstop private underwriters will not, the risk does not disappear. It moves onto the sovereign balance sheet, and the premium reappears as a fiscal cost.