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Donald Trump · Iran · U.S. · U.S. Treasury ·

As Trump administration readies economic warfare measures against Iran, top security official vows retaliation ‘in a seismic

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Mohsen Rezaei at Ayatollah Ruhollah Khomeini's shrine in southern Tehran, Iran, on June 4, 2026.

The new head of Iran’s top security body warned Sunday that Tehran will see any country’s support for new U.S. economic measures against the Islamic Republic as an “act of war,” while Iran’s president defended a memorandum of understanding with the United States as the best way out of the stalled conflict.

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Treasury Secretary Scott Bessent on Monday is expected to announce the new measures after the U.S. vowed to impose an “unprecedented” level of economic warfare and isolation on a country that has lived for decades under sanctions. Meanwhile, attacks calmed on the Strait of Hormuz but posturing did not, as a recently created Iranian authority listed dozens of vessels it said will face restrictions on future transits. Here’s a look at the latest developments in the Iran war and the wider Middle East on Sunday.

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