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A handout picture provided by the Ministry of Presidential affairs-Abu Dhabi on August 12, 2019, shows Mohamed bin Zayed al-Nahyan (R), Crown Prince of Abu Dhabi and Deputy Supreme Commander of the UAE Armed Forces shaking hands with Saudi King Salman bin Abdulaziz near the Saudi holy city of Mecca during his visit to Saudi Arabia. - Abu Dhabi's powerful crown prince visited Saudi Arabia on today and called for dialogue to resolve tensions in Yemen, after deadly clashes there between government loyalists and UAE-backed forces. (Photo by Mohammed Al-HAMMADI / Ministry of Presidential Affairs - Abu Dhabi / AFP) / XGTY / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO /MINISTRY OF PRESIDENTIAL AFFAIRS-ABU DHABI" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read MOHAMMED AL-HAMMADI/AFP via Getty Images)

A handout picture provided by the Ministry of Presidential affairs-Abu Dhabi on August 12, 2019, shows Mohamed bin Zayed al-Nahyan (R), Crown Prince of Abu Dhabi and Deputy Supreme Commander of the UAE Armed Forces shaking hands with Saudi King Salman bin Abdulaziz near the Saudi holy city of Mecca during his visit to Saudi Arabia. - Abu Dhabi's powerful crown prince visited Saudi Arabia on today and called for dialogue to resolve tensions in Yemen, after deadly clashes there between government loyalists and UAE-backed forces. (Photo by Mohammed Al-HAMMADI / Ministry of Presidential Affairs - Abu Dhabi / AFP) / XGTY / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO /MINISTRY OF PRESIDENTIAL AFFAIRS-ABU DHABI" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS        (Photo credit should read MOHAMMED AL-HAMMADI/AFP via Getty Images)