A recent exchange between the United States and Iran in the Persian Gulf highlights the precarious situation in the Strait of Hormuz, where a fragile ceasefire is in jeopardy.
With numerous sailors stranded on both sides of this vital waterway, an American sailor reported a sudden radio transmission over the weekend. The voice, identifiable as North American, stated, “Engaged in transit passage in accordance with international law. No challenge is intended to you, and I intend to abide by the rules of our government’s ceasefire. Over.”
An Iranian voice, familiar to shipping crews in recent weeks, responded with an ultimatum: “You are approaching the Persian Gulf, which violates Iranian law. I advise you to change your course and return to the Indian Ocean immediately. If you do not comply, I will open fire. Out.”
The Iranian military then issued a warning to all vessels in the Strait of Hormuz and the Persian Gulf, declaring, “You must vacate this area immediately, as we are targeting a U.S. Navy warship present in the region.” Analysts noted that such warnings have been a common occurrence since the onset of the conflict, and even prior to it.
In response, the U.S. Navy ship reaffirmed its position: “I intend to transit through Omani territorial waters and will defend my unit if interfered with. No challenge is intended to you, and I intend to abide by the rules of our government ceasefire.” This reaction was characterized as a standard protocol by Jennifer Parker, a former director of operations with the Combined Maritime Forces at U.S. Central Command (CENTCOM). She emphasized that this is typical behavior for both U.S. and Australian naval vessels when confronted while traversing international waters.
Traffic through the Strait of Hormuz has significantly diminished since the Islamic Revolutionary Guard Corps (IRGC) initiated attacks and issued threats against vessels in the area. From February 28 to April 8, only an average of seven ships, including tankers and bulk carriers, transited the strait daily, a stark contrast to the pre-conflict average of over 130 vessels.
The few ships allowed through were granted permission from Iran and generally adopted a new route closer to Iran’s coastline. The recent tense exchange indicates that the U.S. military aims to navigate through the strait to affirm that the shipping lanes remain open, coinciding with statements from U.S. President Donald Trump, who indicated that U.S. Navy operations would commence a blockade of the waterway starting at midnight on April 13 AEST.
The radio confrontation took place on Marine VHF Channel 16, a frequency designated for international emergencies, and was reported to the ABC at 1 PM Gulf Standard Time (GST), shortly before U.S.-Iran negotiations commenced in Islamabad. Parker noted that the Iranian Revolutionary Guard Corps’ assertion of jurisdiction over the strait was unusual, adding that prior to the current conflict, the IRGC would often warn and even harass vessels passing through the Strait of Hormuz.
The narrowest section of the Strait of Hormuz is bordered by Oman and Iran, but international law generally permits free passage for ships. Parker remarked that it is evident Iran is leveraging this situation in its negotiations with the U.S.
The U.S. and Iran have presented conflicting accounts regarding the transit of U.S. Navy vessels through the strait. Marine transponder data indicated a “U.S. GOV VESSEL” positioned to the west of the Strait of Hormuz at 12:20 PM GST. Late Saturday, U.S. Central Command announced that two Navy guided-missile destroyers had successfully transited the strait as part of ongoing operations.
According to their statement, the USS Frank E. Peterson (DDG 121) and USS Michael Murphy (DDG 112) navigated the Strait of Hormuz to ensure it is free of sea mines previously laid by the IRGC. They emphasized that the Strait of Hormuz is an international maritime passage essential for global trade and economic stability, with additional U.S. forces, including underwater drones, set to join the clearance efforts soon.
The New York Times reported, citing several U.S. officials, that the two Navy destroyers entered the Strait of Hormuz and successfully neutralized an Iranian surveillance drone approaching one of the ships. The report indicated that the two Navy vessels had sailed from the Gulf of Oman before entering the strait and subsequently reversed course.
Iran, however, contests the U.S. claims regarding the Navy’s ability to transit through the strait. The Iranian semi-official news agency Tasnim reported that an American destroyer, having departed from Fujairah in the UAE, was met with a military response from Iran. Tasnim further stated that Iranian negotiators raised this issue during discussions with the U.S. delegation through mediators in Pakistan.
