Iran's armed forces announced Saturday they are closing the Strait of Hormuz, a critical shipping channel reopened just three days earlier, citing what they say is American failure to enforce a newly signed ceasefire agreement between the U.S. and Iran.
The move marks the first major confrontation since the two nations signed a memorandum of understanding to end their conflict earlier in the week. It arrives at a sensitive moment, as Trump administration envoys are already stationed in Switzerland preparing for what could be the opening round of nuclear talks scheduled for Sunday.
The Iranian military's central headquarters declared the strait closed to all maritime traffic, accusing the U.S. of breaching commitments and blaming Israel for continuous violations of the ceasefire in southern Lebanon. "Should the aggression continue, further measures have been planned and will be implemented to compel the enemy to abide by and carry out its obligations," the armed forces said in their statement.
The Revolutionary Guards Corps navy reinforced the claim, issuing a warning that vessels should not approach the waterway.
However, U.S. military officials pushed back against the Iranian closure announcement. A senior defense official said the Pentagon has detected no Iranian military movements on the ground that would suggest an actual shutdown of the strait. U.S. Central Command reported Saturday that 55 merchant vessels successfully transited the channel, delivering more than 17 million barrels of oil and large volumes of other cargo to global markets, indicating safe passage remained intact.
The Strait of Hormuz is one of the world's most economically vital shipping routes, channeling roughly one-fifth of global oil supplies through its narrow passage. Any genuine closure would trigger immediate disruptions to energy markets and international commerce.
Iranian Foreign Minister Abbas Araghchi announced his travel to Switzerland shortly before the closure declaration, signaling that despite the escalatory rhetoric, diplomatic engagement remained on the table. The Iranian delegation, led by parliament speaker Mohammad Bagher Ghalibaf, was expected to arrive in Switzerland on Saturday.
The announcement underscores the fragility of the recently brokered ceasefire and the competing security concerns driving both American and Iranian actions in the region.
Author James Rodriguez: "This looks like Iranian theater meant for domestic audiences while diplomats quietly board planes to talk anyway."
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