US Secretary of State Marco Rubio is embarking on a challenging diplomatic effort to convince Gulf Arab states of the benefits of the recently agreed-upon Iran peace deal. Gulf leaders harbor significant concerns that the agreement involves excessive concessions to Iran, potentially bolstering its regional influence. These nations fear a shift in the regional security landscape and potential disruptions to oil markets as a result of a strengthened Iran. Rubio’s visit aims to address these anxieties and reassure allies of the United States’ continued commitment to their security. The mission is considered delicate due to pre-existing distrust and differing perspectives on Iran’s regional ambitions. Success hinges on Rubio’s ability to demonstrate how the deal serves shared interests and mitigates potential risks for Gulf states. The outcome of these discussions will be crucial for maintaining regional stability.