Kerry delivered the remarks to US Embassy employees a day after meeting with Saudi and other Gulf officials on a visit aimed at reassuring US allies who are skeptical about the agreement.     

Saudi Arabia and other Gulf countries have long viewed Iran as a regional menace, and Riyadh and Tehran back opposite sides in the wars in Syria and Yemen.

The nuclear deal, which was implemented a week ago after the UN certified that Iran had curbed its nuclear activities, lifted crippling sanctions on Tehran and unfroze billions of dollars in assets.

He said he had discussed "new ideas" to bring peace to Yemen, where the Saudi-backed government is battling Iran-supported Shiite rebels.

He added that Saudi Arabia is "committed to work with us in the efforts to try to stabilize Syria and calm down this hyped-up, exploited division between Sunni and Shia."

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