Martin Griffiths, top, the United Nations envoy for Yemen, gives a video briefing to the Security Council at U.N. headquarters Friday, Dec. 14, 2018. Griffiths told the council that a speedy presence in the field is "an essential part of the confidence" needed to accompany implementation of Thursday's agreement between Yemen's government and Houthi Shiite rebels. (Eskinder Debebe/United Nations via AP)
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