A man walks past the Qatar Airways branch in the Saudi capital, Riyadh, on Monday. Saudi Arabia and other Gulf states severed relations with Qatar and restricted Qatari planes' use of their airspace. Fayez Nureldine/AFP/Getty Images hide caption

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Fayez Nureldine/AFP/Getty Images

A member of the Saudi border guards mans a machine gun at the border with Iraq in July. Since the so-called Islamic State launched its offensive this summer in Iraq, Saudi Arabia has sent thousands of troops to the region. Faisal Nasser/Reuters/Landov hide caption

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Faisal Nasser/Reuters/Landov

Facing Threats From ISIS And Iran, Gulf States Set To Join Forces

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