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Ueli Maurer, Vice President of the Swiss Confederation and head of the Finance Department, attends 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)