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US Secretary of State John Kerry (L) speaks with Oman's Sultan Qaboos bin Said during a meeting at Bait al-Baraka in Muscat on May 21, 2013. Kerry arrived in Oman aiming to help finalise an estimated $2.1 billion deal to supply a US-made air-defence system to the Gulf nation. AFP PHOTO/POOL/JIM YOUNG (Photo by JIM YOUNG / POOL / AFP) (Photo credit should read JIM YOUNG/AFP/Getty Images)

US Secretary of State John Kerry (L) speaks with Oman's Sultan Qaboos bin Said during a meeting at Bait al-Baraka in Muscat on May 21, 2013. Kerry arrived in Oman aiming to help finalise an estimated $2.1 billion deal to supply a US-made air-defence system to the Gulf nation. AFP PHOTO/POOL/JIM YOUNG (Photo by JIM YOUNG / POOL / AFP)        (Photo credit should read JIM YOUNG/AFP/Getty Images)