Thirty nations sent military planners to the UK Permanent Joint Headquarters at Northwood on 22-23 April 2026 to translate the 51-nation Paris posture into an operational Strait of Hormuz plan covering warships, armed convoy escorts, mine-hunting drones, radar coverage and intelligence-sharing 1. The Northwood summit itself opened on 22 April . No participating nation published rules of engagement, and the deployment trigger remains "as soon as conditions permit, following a sustainable Ceasefire."
The White House confirmed a two-tier Ceasefire ruling that explicitly excludes European, Asian and Gulf-flagged shipping from Ceasefire cover regardless of escort architecture. Saudi Arabia and the Gulf Cooperation Council (GCC) still sit off the Coalition paper despite Riyadh's welcome of the 21 April Ceasefire extension. Every European, Asian or Gulf-flagged vessel in the strait operates without the umbrella the paper would otherwise extend, even when sailing inside a Coalition convoy.
Allied exclusion makes the Northwood architecture coercive of allies as much as of Iran. The Hormuz plan exists on paper at Northwood; the Ceasefire that would activate it does not. France, the United Kingdom and the other 28 participants have committed hulls and radar to a framework the United States controls the trigger on, and US reading of Ceasefire cover decides which of their hulls are covered when a mine-layer breaks for open water.
The Pentagon email leaked on 24 April closes the loop. European capitals that declined the Iran-campaign ABO request are the same capitals that now watch their flagged shipping sit outside the Ceasefire bubble. Article 42.7 of the EU treaty, the mutual-defence clause raised at the Cyprus summit, is the institutional counterweight, but it reaches the flag rather than the cargo, and the cargoes are already at sea.
