Arab Gulf countries, battered economically and physically by the war with Iran, were keen to put on a united front at a key regional meeting on April 28, 2026.

Gathering in the Saudi city Jeddah, representatives of the Gulf Cooperation Council warned the Iranian government in Tehran that an attack on any one of its six members would be taken as an attack on all. Rejecting Iran’s claims to control of the Strait of Hormuz, Qatari Emir Sheikh Tamim bin Hamad Al Thani later described the summit as embodying “the unified Gulf stance” over the conflict.

The show of togetherness may seem at odds with other recent developments that have seen members of the GCC split over policy and vision for the region – not least the United Arab Emirate’s decision to quit the oil cartel OPEC.

But to followers of Gulf politics, like myself, the scene felt familiar. Time and again, Iran has accomplished what no outside mediator could: It has pushed divided Gulf Arab states together. When tensions rise, the monarchies of the GCC – Bahrain, Qatar, UAE, Saudi Arabia, Kuwait and Oman – tend to stand united, at least publicly.

From revolution to coordination

The modern Gulf security environment was profoundly shaped by the 1979 Iranian Revolution.

Iran shares a narrow and strategically vital waterway with the Gulf states but has long differed in identity and outlook. Specifically, Iran’s Shiite revolutionary model contrasts with the Sunni-led monarchies across the region.

Before 1979, when Iran was ruled by Shah Mohammad Reza Pahlavi Iran and Saudi Arabia, the largest of the Sunni Arab Gulf states, were regarded by Washington as “twin pillars,” protecting American interests in the Middle East. Their relationship was cooperative, but not close.

Then the emergence of the Islamic Republic after the revolution in 1979 introduced a new kind of regional actor – one defined not only by state power but also by Shiite ideological ambition.

Gulf monarchies’ concern over both external security and internal stability was reinforced by the 1979 Grand Mosque seizure in Saudi Arabia, when Islamist militants seized Islam’s holiest site.........

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