Patrick Cammaert arrives at the Sanaa International Airport in Sanaa, Yemen, on Dec. 23, 2018. The head of a UN team monitoring the UN-backed cease-fire in Yemen's Red Sea port city of Hodeidah arrived on Sunday in Yemen's rebel-held capital Sanaa. Patrick Cammaert, a retired Dutch general, joined his six-member team, which arrived in Sanaa a day earlier, before heading for Hodeidah to monitor the withdrawal of the Yemeni rival forces in a few hours. (Xinhua/Mohammed Mohammed)