Treasury Secretary Scott Bessent says U.S. will impose “toughest sanctions in history” on Iran next week as diplomacy stalls

U.S. Treasury Secretary Scott Bessent announced on Thursday that the United States will impose some of the “toughest sanctions in history” on Iran next week, escalating an economic pressure campaign as diplomacy with Tehran appears to be stalled. The announcement, delivered ahead of the next round of planned measures, was presented as a continuation of the Trump administration’s broader approach of using financial and trade restrictions as leverage rather than relying on talks alone.

Bessent’s comments positioned the sanctions as a response to the lack of meaningful diplomatic movement, indicating that the administration is prepared to increase pressure even as negotiations have not yielded the outcomes the U.S. has sought. The Treasury secretary did not provide in the announcement itself additional country-by-country or sector-by-sector detail in the report, but he described the action as an escalation of the existing sanctions posture.

The timing is set to land immediately after the announcement, with the new measures slated for “next week,” according to the report. That schedule places the U.S. action early in the week following Thursday’s statement, with companies and financial institutions expected to prepare for compliance changes and potential new prohibitions or restrictions tied to Iranian-linked activity.

The report also pointed to disruption in regional maritime activity, citing that traffic through the Strait appears to be stagnating amid the broader security and economic pressure environment. While the specific mechanisms tying sanctions to shipping conditions were not detailed in the report, the mention of strait traffic as part of the same package of developments underscores how the administration links economic tools to pressure effects beyond the financial system.

The U.S. sanctions campaign is widely used as a means to increase costs for Iran’s economy and its networks, including by restricting access to markets, banking services, and certain commercial dealings involving Iranian entities. In that framework, Thursday’s announcement was described as a doubling down on “economic warfare” strategy, suggesting the administration is treating economic isolation and compliance risk as a primary instrument in its foreign policy approach.

For businesses operating internationally, the practical impact of sanctions updates typically centers on heightened due diligence requirements, screening for Iranian nexus risk, and potential changes to payment and shipping channels. Because sanctions measures often come with short compliance timelines, the next-week schedule described by Bessent creates an immediate operational window for firms subject to U.S. jurisdiction or connected to U.S. financial systems.

The escalation also raises questions about how diplomacy and sanctions will interact going forward. If negotiations do not restart or do not produce verifiable steps by Iran, the U.S. may continue to increase restrictions, while any movement in talks could influence whether the U.S. pauses, modifies, or accelerates enforcement actions. As of Thursday’s announcement, the direction of travel described in the report is toward additional tightening rather than de-escalation.

The reported “toughest sanctions in history” language sets expectations for a major increase in pressure. The next week’s action will determine the extent of new restrictions, including what entities, activities, and payment channels are targeted, and how enforcement will be carried out. Companies and counterparties will be watching for formal guidance from the Treasury Department and other relevant U.S. agencies as the measures take effect.