Iran Warns Vessel Charterers as Strait of Hormuz Dispute Deepens
Iran has escalated its warnings to the commercial shipping industry, telling vessel charterers that ships attempting to transit the Strait of Hormuz without complying with Iranian procedures could face restrictions on future passages.
The warning was issued by Iran's Persian Gulf Strait Authority (PGSA), which maintains a non-compliance list of vessels it says have violated its transit requirements. The latest warning specifically targets charterers that allegedly pressure shipmasters to proceed through the strait without obtaining the necessary approval.
The PGSA published a redacted letter purportedly from a shipowner seeking protection from liability after a charterer allegedly instructed a vessel to make an unauthorized transit. The authority warned that such instructions could expose shipowners, masters and crews to financial and safety risks.
According to the PGSA, charterers found to be directing vessels through what Iran considers unauthorized routes could themselves be placed on its non-compliance list, with restrictions potentially extending to other vessels operated or chartered by those companies. Seatrade Maritime reported that the list had reached 81 vessels by September 28.
The dispute creates a difficult compliance environment for international shipping companies because Iranian transit requirements conflict with U.S. sanctions and Washington's position on freedom of navigation through the waterway.
### Iran Maintains Its Claim Over Hormuz
Iranian military officials have continued to assert that Tehran maintains operational control over the Strait of Hormuz.
The claims have been rejected by U.S. Central Command. CENTCOM said on September 28 that thousands of vessels have continued to transit the waterway and that more than one billion barrels of oil have moved through the strait in recent months.
Commercial shipping data, however, shows that traffic remains substantially below normal levels. Reuters reported that an average of about 18 vessels were crossing the strait each day in recent weeks, compared with roughly 125 large commercial vessels per day before the conflict.
At the same time, U.S.-protected tanker movements have increased, allowing larger volumes of crude to leave the Gulf despite the continuing security risks.
### Iran Claims Further Attacks on Shipping
Iran has also claimed that its forces launched cruise missiles and drones against vessels it considered non-compliant.
The claims have not been independently substantiated in all cases. Iranian state-linked media have reported additional attacks against vessels accused of violating Tehran's requirements, while maritime security organizations have not publicly confirmed every incident.
The broader security situation remains serious. Reuters previously reported that Iran claimed attacks against multiple ships near the Strait of Hormuz during the conflict, while more recent reporting has documented continued vessel movements through the waterway.
### Shipping Industry Caught Between Competing Rules
For shipowners, operators and charterers, the dispute presents competing regulatory and security pressures.
Following Iranian procedures may expose companies to potential U.S. sanctions concerns, while ignoring Iranian demands could result in threats of detention, financial penalties or restrictions on future access to the strait.
The situation is particularly significant for tanker operators because Hormuz remains one of the world's most important energy chokepoints. Recent increases in Saudi Arabian crude exports through the waterway have also placed additional pressure on available tanker capacity and regional logistics.
Meanwhile, Saudi Arabia has restarted crude loadings at its Red Sea port of Yanbu after repairs to the East-West Pipeline, providing another outlet for Gulf oil exports. Reuters reported that Middle Eastern crude exports have recovered toward levels seen before the latest escalation, although shipping remains more complicated and expensive than under normal conditions.
Talks Continue Despite the Maritime Dispute
The latest shipping warnings come as indirect diplomatic contacts between Iran and the United States continue.
Iran has proposed reopening the Strait of Hormuz as part of broader negotiations, including demands concerning the U.S. naval blockade and sanctions. President Donald Trump rejected Iran's latest terms, although diplomatic contacts through mediators have continued.
For the maritime industry, the immediate issue remains whether commercial vessels can continue moving through Hormuz without becoming caught between competing demands from Iran and the United States.
With the PGSA continuing to expand its non-compliance list and commercial traffic still well below pre-conflict levels, shipowners and charterers face continued uncertainty over both the security and regulatory environment surrounding one of the world's most important shipping routes.