United Nations Secretary-General Antonio Guterres (L, Front) arrives for the High-Level Pledging Event for the Humanitarian Crisis in Yemen in Geneva, Switzerland, on Feb. 26, 2019. United Nations Secretary-General Antonio Guterres on Tuesday described the pledging conference for humanitarian aid for war-plagued Yemen a "success" after donation assurances reached 2.6 billion U.S. dollars, up from 2 billion U.S. dollars in 2018. (Xinhua/Xu Jinquan)