United Nations Special Envoy to Yemen Martin Griffiths (R) meets with Yemen's internationally-backed President Abdu-Rabbu Mansour Hadi in Aden, Yemen, on June 27, 2018. Martin Griffiths arrived Wednesday in the southern port city of Aden to broker a ceasefire between the Saudi Arabia-backed government forces and Shiite Houthi rebels. (Xinhua/Ismail Rabidhy)