President Donald Trump has announced a new campaign of economic pressure against Iran, describing it as the most aggressive economic operation the US has ever launched against another country.

Trump said the campaign would seek to further isolate Iran financially and warned that countries, banks and companies continuing to do business with Tehran could also face serious economic consequences. The administration is expected to target Iranian oil sales, financial transactions and networks used to bypass existing sanctions.

The move follows stalled efforts to reach a diplomatic agreement. Washington has been pushing Iran to abandon its nuclear program and ease restrictions around the Strait of Hormuz, while Tehran has resisted US conditions.

Treasury Secretary Scott Bessent said the US is preparing what he called the toughest sanctions ever imposed on Iran, with more details expected. China could become particularly important because it buys more than 80% of Iran’s shipped oil, according to Reuters. Beijing has rejected Washington’s sanctions approach and called for diplomacy instead.

Iran has dismissed Trump’s threats, accusing Washington of using economic pressure instead of serious negotiations. Tehran has already spent decades operating under US sanctions, raising questions about how much additional pressure the new campaign can create.

Investor takeaway: The biggest market risk is energy. Tougher restrictions on Iranian oil exports, especially if they affect buyers such as China, could tighten global supply and keep oil prices volatile. The possibility of further disruption around the Strait of Hormuz adds another layer of uncertainty.

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