Bessent expects new US secondary sanctions weekly, aiming to increase pressure on Iran - Reuters

U.S. Treasury Secretary Scott Bessent expects new secondary sanctions on Iran to be introduced on a weekly basis, according to Reuters. The announcement signals a deliberate acceleration of economic pressure, moving beyond existing measures that already constrain Iranian oil exports and access to international finance.

Secondary sanctions are a distinct policy tool: they threaten to cut off foreign companies, banks, and insurers from the U.S. financial system if they facilitate transactions with sanctioned entities in Iran. Unlike primary sanctions, they apply extraterritorially. For global markets, the practical impact is often felt first in crude oil supply chains, shipping costs, and freight insurance, as compliance teams scramble to verify that vessels and counterparties are not exposed.

What matters now is the scope and pace of the new designations. Weekly actions would give market participants a steady stream of headlines to digest, but the key variable is whether enforcement shifts toward large buyers of Iranian crude, such as Chinese refiners, or remains focused on smaller intermediaries. Also worth watching is how trading partners respond, since the credibility of secondary sanctions depends on foreign cooperation. For now, the clear signal from Washington is that pressure will be incremental, persistent, and difficult to price in fully.