US Treasury warns of unprecedented financial crackdown on Iran

The United States is preparing what officials describe as the most extensive financial offensive against Iran to date. Treasury Secretary Janet Yellen announced that Washington will move to sever all remaining economic ties with Tehran, signalling a new phase in a sanctions regime that has already targeted Iran’s oil exports, banking sector and key individuals.

In a briefing, senior Treasury official Scott Bessent emphasized that the U.S. will not only isolate Iran but also any country that chooses to engage with it financially. “Any nation that partners with Iran on financial matters will face isolation,” Bessent said, underscoring Washington’s intent to deter secondary sanctions and discourage multinational cooperation with the Iranian economy.

The announcement follows a series of diplomatic tensions over Iran’s nuclear activities and regional behavior. Over the past decade, the United States has layered sanctions through the Office of Foreign Assets Control (OFAC), aiming to limit Tehran’s access to the global financial system. The latest threat suggests a broader application of these tools, potentially affecting banks, insurers and trade partners that facilitate Iranian transactions.

Analysts note that while sanctions have already strained Iran’s economy—reducing oil revenues and inflating inflation—the new “greatest financial offensive” could further restrict the country’s ability to conduct international trade. The move also aligns with broader U.S. strategy to pressure Iran into compliance with nuclear agreements and curb its support for proxy groups.

Countries with significant trade links to Iran, such as China, Russia and several Gulf states, are likely to reassess their exposure. The Treasury’s warning serves as a clear signal that continued financial engagement with Tehran may invite punitive measures, adding another layer of complexity to global economic relations.