US readies toughest Iran sanctions in Treasury history

• The United States is preparing to expand its economic sanctions against Iran, with the measures expected to target Iran's revenue streams and trade networks in an effort to intensify economic pressure on Tehran, according to a report by the New York Times.
• Treasury Secretary Scott Bessent described the upcoming sanctions as potentially the toughest in history, signalling a shift towards more aggressive economic measures than those previously implemented under the existing campaign.
• The expanded sanctions represent a significant escalation of the US economic pressure campaign against Iran, which has been in place since the collapse of the Joint Comprehensive Plan of Action in 2018 when the United States withdrew from the nuclear agreement.

The measures are expected to further isolate Iran economically by targeting the revenue sources and international trade relationships that Tehran relies on to fund its government and military operations.

The announcement comes amid ongoing uncertainty about the prospects for a new US-Iran diplomatic agreement in 2026, following the collapse of the Memorandum of Understanding signed in June 2026 and subsequent military exchanges between the two countries.

Market observers will be monitoring for official announcements from the US Treasury Department detailing the specific targets and scope of the new sanctions, which could influence global energy markets, commodity prices, and risk sentiment across financial markets.

Any diplomatic responses from Iran or its regional allies following the announcement may provide signals about whether the intensified pressure is likely to bring Tehran back to the negotiating table or accelerate further escalation.

Geopolitical developments including military actions or new diplomatic engagements between the US and Iran are expected to remain key variables shaping both market sentiment and the probability of a negotiated resolution to the ongoing conflict.