Mohammed bin Zayed Al Nahyan - Mohammed bin Salman [Getty Images]

RIYADH, SAUDI ARABIA - APRIL 20: Crown Prince of Abu Dhabi and Deputy Supreme Commander of the UAE Armed Forces, Mohammed bin Zayed Al Nahyan (R) meets Saudi Defence Minister and Deputy Crown Prince Mohammed bin Salman (L) as part of the GCC Defence Ministrial summit in Riyadh on April 20, 2016. (Photo by Pool / Bandar Algaloud/Anadolu Agency/Getty Images)

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