UN Secretary-General Antonio Guterres delivers a speech during the High-Level Pledging Event for the Humanitarian Crisis in Yemen at Palais des Nations in Geneva, Switzerland, April 3, 2018. UN Secretary-General Antonio Guterres applauded Tuesday international pledges of more than 2 billion U.S. dollars in 2018 for the three-year-old crisis in Yemen. (Xinhua/Xu Jinquan)?