Saudi King Salman bin Abdulaziz (R) meets with the United Arab Emirates' vice president and Ruler of Dubai, Sheikh Mohammed bin Rashid al-Maktoum, upon the latters arrival to attend the 136th Gulf Cooperation Council (GCC) summit, in the Saudi capital Riyadh, on December 9, 2015. Gulf monarchs began arriving in Saudi Arabia for an annual summit, facing challenges including plunging oil revenues, the war in Yemen, pressure for peace in Syria and signs of regional divisions. / AFP / FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)
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AFP FAYEZ NURELDINE