Iran's Hormuz strait rules include enforcing penalties, revoking permissions if ships do not comply

What Happened

On Sunday, Iran’s Persian Gulf Strait Authority (PGSA) announced the closure of the Strait of Hormuz in response to Israeli attacks in Lebanon, imposing requirements that vessels seek permission, disclose ownership, origin, and cargo, and warning of penalties, permit revocations, or legal action for non-compliance. The PGSA also reserved the right to introduce insurance fees. While US Central Command claimed the waterway remained open and 55 merchant ships transited on Saturday, data from Windward AI showed only 32 ships crossed that day, and analytics firm Kpler recorded a plunge in traffic. Windward noted that 65% of crude oil exports since June 8 were destined for China, and three sanctioned Very Large Crude Oil Carriers—including one Iranian-flagged—were operating openly, a shift attributed to a US-Iran Memorandum of Understanding signed on 17 June.

Key Actors

Why It Matters

The Strait of Hormuz is a critical chokepoint for global oil supplies; Iran’s move escalates the long-standing conflict by directly weaponizing maritime transit. This shift, enabled by a perceived US retreat (the MoU and ceasefire), could yield massive financial gains for Iran—J.P. Morgan estimates $70–90 billion annually in tolls—while imposing costs on Israel and testing US-Israeli relations. It marks a strategic failure of the 'maximum pressure' campaign and potentially reshapes regional power dynamics, with Iran’s IRGC-led regime empowered and the threat of a nuclear dimension unresolved.

Watch For

Monitor actual traffic levels in Hormuz via Kpler and Windward data; any US naval response or further ship interceptions; IAEA reports on Iran’s nuclear advances amid the crisis; Trump-Netanyahu diplomatic exchanges and potential US policy shifts ahead of federal elections; whether Iran formally imposes tolls or insurance fees; reactions from GCC states and China (major oil importer); any Israeli strikes on Hezbollah that might prompt further Iranian closure threats; the expiration or renewal of the US-Iran MoU.