Fresh hostilities in Gulf suggest US-Iran memorandum was too broadly worded

What Happened

Ten days after Iran and the US signed a 14-point memorandum of understanding (MoU) to de-escalate, hostilities resumed in the Gulf. The MoU’s deliberately broad wording on the Lebanon ceasefire and Strait of Hormuz allowed conflicting interpretations. On Lebanon, a Lucerne-brokered ceasefire (including a deconfliction role for Iran and Hezbollah) clashed with a Washington-signed ceasefire between Israel and Lebanon on Friday, which excludes Iran, allows Israel to stay until Hezbollah’s disarmament, and grants Israel immunity from war crimes prosecution. In the Strait of Hormuz, the MoU tasked Iran with making “arrangements using its best efforts for the safe passage of commercial vessels” for 60 days. Iran’s Islamic Revolutionary Guard Corps Navy (IRGCN) declared ships could only use the northern route. On Thursday, the Singapore-flagged container ship Ever Lovely was struck while transiting a southern route near Oman, prompting the International Maritime Organization to halt its evacuation plan. Each side accuses the other of violating the MoU.

Key Actors

Why It Matters

The collapse of the US-Iran MoU risks reigniting direct conflict, disrupts maritime trade through the Strait of Hormuz, and deepens the Lebanon ceasefire impasse. The competing diplomatic tracks underscore growing US-Israeli alignment that sidelines Iran and its proxies, potentially forcing Tehran into escalatory responses. The ship attack demonstrates Iran’s ability to cripple global oil transit routes, while the legal and diplomatic fallout tests the durability of US-led security arrangements in the Gulf.

Watch For

Watch for additional Iranian strikes on commercial shipping and responses from the IMO or US Navy. Monitor whether the IRGCN extends or modifies its strait transit directives. In Lebanon, observe Hezbollah’s public reaction and any military moves against the Israeli presence; the Washington deal’s implementation hinges on disarming Hezbollah, which could trigger renewed violence. Track statements from Russia and China, particularly regarding the legal interpretation of the strait under UNCLOS.