Convoy of the UN Special Envoy to Yemen Martin Griffiths leaves the Sanaa Airport in Sanaa, Yemen, Jan. 28, 2019. The UN Special Envoy to Yemen Martin Griffiths arrived on Monday in Yemen's rebel-held capital Sanaa to break a stalemate in the Red Sea port city of Hodeidah. It was Griffiths' third trip to Sanaa this month amid attempts to push forward the implementation of a cease-fire and withdrawal of Yemen's rival forces from the port city in line with a peace deal reached in Stockholm last month. (Xinhua/Mohammed Mohammed)