The United States has threatened to impose what it calls the most severe economic sanctions ever levied against any country, targeting Iran in a declared shift away from large-scale military operations toward financial warfare roughly six months into an ongoing conflict between the two countries.
Treasury Secretary Scott Bessent told CNBC that the measures would impose "the toughest sanctions in history" on Iran, with the explicit aim of collapsing the Iranian government. He described the broader effort as "the greatest coordinated economic isolation in the history of the world."
President Trump separately promised "the most crushing economic operation ever taken against any country" and warned of "tremendous consequences" for any government continuing to engage economically with Tehran, according to Al Jazeera.
Full details of the sanctions package are to be announced at a press conference on Monday, 24 August. The measures were jointly announced by the US Treasury Department and Pentagon under the name "Operation Economic Fury" and will accompany a naval blockade on Iran already in place, the BBC reported.
Bessent framed the economic pressure as a way to minimise the need for what he called a "large-scale kinetic restart" of the conflict, according to the BBC. The choice of language signals that Washington regards the sanctions campaign as an instrument of war rather than a diplomatic tool.
Third-party countries face direct warnings. Al Jazeera reported that Bessent told governments that transferring money to Iran, purchasing its oil, or providing seaborne transport on its behalf would trigger enforcement action by the US Treasury. He framed the choice in stark terms: "you're either with us or against us."
China, Iran's most significant trading partner, was named explicitly. The US called on Beijing to cooperate with the sanctions effort. China has responded that sanctions do not help, Reuters reported. Whether Beijing will comply or face US enforcement action remains unknown.
The specific countries and entities to be designated under the new package have not been disclosed. The precise legal mechanisms through which third-party penalties would be enforced are also unclear ahead of Monday's announcement.
As part of the broader pressure campaign, the US announced new sanctions targeting Hezbollah over alleged links to Iran's Islamic Revolutionary Guard Corps Quds Force (IRGC-QF), and re-designated the group as a Specially Designated Global Terrorist, Al Jazeera reported.
Iran has rejected the threats in forceful terms. The IRGC dismissed the sanctions as "an implicit admission of the enemy's humiliating defeat in the military arena" and claimed Iran could "easily establish economic relations with countries," CNBC reported.
Iran's foreign ministry went further, condemning the measures as "economic terrorism" and "illegal and inhumane," arguing they would harm ordinary Iranians and amount to crimes against humanity, Al Jazeera reported.
On the military side, Iran's Armed Forces Chief of Staff, Major General Ali Abdollahi, warned that the Islamic Republic's response to the new US threats would be "crushing, punishing and devastating" across land, sea, air, air defence, and cyberspace, according to Reuters. What specific actions Iran is prepared to take remains unknown.
The standoff is already reverberating through global markets and shipping. Traffic through the Strait of Hormuz, a critical chokepoint for international oil flows, has fallen sharply, and oil prices continue to rise. NATO has convened a meeting to discuss the situation at the strait, Reuters reported.
Whether the sanctions will achieve Washington's stated objective of bringing down the Iranian government remains an open question. The extent of Iran's economic deterioration under existing measures has not been fully disclosed, and the compliance of major trading partners, above all China, will determine how much pressure the campaign can actually apply.
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