Saudi King Salman bin Abdulaziz (R) welcomes Emir of Kuwait, Sheikh Sabah al-Ahmad al-Sabah upon his arrival for the Gulf Cooperation Council (GCC) summit in Riyadh on May 5, 2015. The GCC summit came amid mounting international concern over the Saudi-led air war on Shiite rebels in Yemen, the threat from jihadists and Gulf worries over their Shiite rival Iran.  AFP PHOTO / FAYEZ NURELDINE        (Photo credit should read FAYEZ NURELDINE/AFP via Getty Images)