Iran and the Gulf — The United States in the Gulf

The parties

• Iran and the Gulf adversarial relationship with The United States in the Gulf

A symmetric arrangement: it reads the same from either side. Authored once, on one record.

Status

Active

In force and operating. Says nothing about how well it is working, or about which way it is heading.

Last material change: 2026-02-28.

What the arrangement covers

Categories the arrangement is documented to include. Not a measure: a relationship covering more of them is described in more detail, not held more firmly.

Summary

This record describes the standing relationship, not the current campaign. Diplomatic relations were severed in 1980 and have not been restored, and both states have maintained an openly adversarial posture toward each other since. On 28 February 2026 that relationship entered open armed conflict: by 25 March the Congressional Research Service recorded more than ten thousand targets struck in Iran, and Iran had fired thousands of drones and missiles across the region. A memorandum of understanding signed on 17 June 2026 produced a sixty-day pause that broke down within three weeks and expired unextended on 17 August. At the research cutoff no agreement was in force. The type carries one value by design: Vigil does not grade how adversarial a relationship is.

Why it matters

Almost every other relationship in this module is positioned relative to this one — the Gulf basing arrangements, the sanctions architecture, the mediation channels and the divergence among the Gulf states themselves. It is the axis the regional system is currently organised around, which is precisely why it is recorded as a durable structure rather than as a description of the fighting.

Agreements

• Memorandum of understanding on the Strait of Hormuz and a negotiating period · signed 2026-06-17 · ended 2026-08-17

  Signed by the Iranian President and the United States President; Pakistan hosted and mediated. Established a sixty-day negotiating window and, on the Iranian side, an undertaking to use best efforts for the safe passage of commercial vessels without charge for sixty days only. It was declared over by the United States President on 7 July 2026 and expired unextended on 17 August. The parties' own term is "memorandum of understanding" — it is not styled a ceasefire, an armistice or a peace agreement, and Vigil does not relabel it. Its fourteen points have not been read in an official text and are not authored.

Related events

• United States and Israeli strikes on Iran open the war 28 Feb 2026

  Military · Weapons deliveries

• The United States and Iran sign a memorandum of understanding 17 Jun 2026

  Diplomatic · Maritime

• The United States President declares the memorandum over 7 Jul 2026

  Diplomatic · Maritime

• The memorandum of understanding expires unextended 17 Aug 2026

  Diplomatic

What remains unknown

• The memorandum's operative points are known only through reporting. No official text has been read, and the point-by-point content is not authored.
• Casualty and damage figures claimed by either party are not treated as established. Where this module carries them, the claimant is named.