Iran on Friday reaffirmed its claim to authority over shipping in the Strait of Hormuz and cautioned Gulf Arab states against aligning with Washington, a day after an attack on a vessel near Oman underscored the vulnerability of the preliminary accord meant to end the war with Tehran.

The Iranian response came after what it described as an “interventionist, irresponsible and provocative” joint statement issued by the United States and six Gulf nations, which rejected Tehran’s insistence that it could levy tolls on ships passing through the strategic waterway. In a post on X, Deputy Foreign Minister Kazem Gharibabadi asserted that “Safe passage through the Strait of Hormuz cannot be guaranteed under ambiguous arrangements, parallel routes or decision-making that does not take Iran’s role as a coastal state into account.”

Despite the conflicting interpretations of last week’s interim U.S.-Iran deal and a slowdown in traffic through the strait—through which roughly one-fifth of global oil and liquefied natural gas supplies typically pass—oil prices dipped further on Friday. Shipping data showed that Saudi Aramco resumed crude loadings at its Ras Tanura terminal, the world’s largest oil port, after a nearly four-month halt.

Secretary of State Marco Rubio, concluding a Gulf tour aimed at reassuring regional allies about the interim pact, told reporters Thursday that if Iran threatened or blocked ships in the strait, “we’re going to have a problem.” In their joint statement, Rubio and the Gulf Cooperation Council called for “free, unconditional, and unrestricted navigation” in the Strait of Hormuz without tolls or “attempts to assert control,” and insisted that a lasting peace must address Iran’s ballistic missiles, drones and support for proxy groups.

Iran’s foreign ministry responded Friday by saying the U.S. military presence in the Gulf was the source of regional insecurity and division, and argued that the strait should be managed by Tehran and Oman in line with the interim deal’s terms. “We warn against the continuation of hostile and interventionist policies in the region,” it said.

Tehran effectively seized control of the waterway after U.S.-Israeli strikes on Iran on Feb. 28 triggered the war, disrupting oil flows and roiling global energy markets and the wider economy. Taiwan’s Evergreen Marine said Friday that its Singapore-flagged ship, the Ever Lovely, had been struck near Oman on Thursday by an “unknown object” while on a route recommended by the British navy agency UKMTO. No one was injured, and the vessel later resumed its journey out of the strait. Two U.S. officials told Reuters that Iran had fired on the ship, while Iran’s Persian Gulf Strait Authority—established by Tehran to manage transit requests—said passage through unauthorized routes would be “the responsibility of the owner, operator, and vessel commander.”

President Donald Trump warned earlier this month that if Iran failed to honor the interim deal, including reopening the strait, the U.S. would likely resume bombing the country. Beyond the dispute over control of the waterway, disagreements persist over other elements of the framework ceasefire deal, including financial incentives for Iran, nuclear inspections, and Israel’s parallel war in Lebanon. The deal has established a 60-day window for talks on thornier issues, including Iran’s nuclear program. In the United States, the war is weighing heavily on Trump ahead of November midterm elections that will determine control of Congress.

The International Maritime Organization, a U.N. agency, temporarily paused its operation to escort ships through the Strait of Hormuz after the Oman incident. The IMO and Oman had earlier this week announced a new southern route through the strait to evacuate hundreds of ships stranded by the war, angering Tehran. South Korea’s President Lee Jae Myung said Friday that three South Korean ships would leave the Strait of Hormuz over the weekend, after the Oceans Ministry reported eight more South Korean vessels had already exited.

Two Very Large Crude Carriers controlled by Saudi Arabia’s shipping arm Bahri were seen loading crude at Ras Tanura, while another waited nearby, shipping data showed. Each VLCC can load 2 million barrels of oil. Ras Tanura sits on Saudi Arabia’s eastern coast on the Gulf and is west of the Strait of Hormuz. It used to export more than 5 million barrels per day of crude before the conflict.