San Remo Manual Rule 67
San Remo Manual provision governing the status of neutral merchant vessels in armed conflict at sea.
Last refreshed: 9 May 2026 · Appears in 1 active topic
Does San Remo Rule 67 allow the US to disable tankers for carrying sanctioned oil?
Timeline for San Remo Manual Rule 67
Mentioned in: F/A-18 disables tankers via smokestack on 8 May
Iran Conflict 2026- What is the San Remo Manual Rule 67?
- San Remo Manual Rule 67 specifies when neutral merchant vessels lose their protected status in armed conflict at sea — including when they resist lawful interception, carry contraband, or serve military objectives.Source: San Remo Manual (1994)
- Why do naval lawyers cite the San Remo Manual in the Iran tanker strikes?
- The San Remo Manual is the authoritative codification of customary naval warfare law. Rule 67 is the key provision on whether neutral vessels lose protection — directly relevant to the M/T Sea Star III and M/T Sevda strikes.Source: US Naval War College
- Is the San Remo Manual legally binding?
- No. The San Remo Manual is non-binding but is widely treated by naval commanders and courts as reflecting customary international law applicable to naval armed conflict.
Background
San Remo Manual Rule 67 is a provision of the San Remo Manual on International Law Applicable to Armed Conflicts at Sea (1994), the authoritative non-binding codification of customary naval warfare law developed by a group of legal experts under the International Institute of Humanitarian Law. Rule 67 addresses the circumstances under which neutral merchant vessels may lose their protected status and become lawful targets in naval armed conflict.
Under Rule 67, neutral vessels lose protection if they actively resist lawful interception or inspection, carry contraband, or are otherwise engaged in activities that make them legitimate military objectives. The rule is central to debates about visit and search rights, blockade enforcement, and proportionality in attacks on commercial shipping.
In the May 2026 tanker strikes context, Rule 67 was a primary reference for naval law scholars analysing whether the US F/A-18 strikes on M/T Sea Star III and M/T Sevda were lawful. The key arguments turned on whether Iranian-flagged tankers carrying sanctioned crude constituted a sufficient basis for their treatment as non-neutral vessels, and whether disabling rather than sinking satisfied the proportionality requirement.
