Yemen's foreign minister Khaled al-Yamani (L) and the head orebel negotiator Mohammed Abdelsalam (R) shake hands under the eyes of United Nations Secretary General Antonio Guterres (C), during peace consultations taking place at Johannesberg Castle in Rimbo, north of Stockholm, Sweden, on December 13, 2018. - Yemen's government and rebels have agreed to a ceasefire in flashpoint Hodeida, where the United Nations will now play a central role, the UN chief said. (Photo by Jonathan NACKSTRAND / AFP)        (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)