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The United Nations has warned of a "humanitarian catastrophe" in South Sudan. The conflict between supporters of President Salva Kiir and his long-time rival, Riek Machar, has led to thousands of people fleeing the violence. Hunger and disease are also on the rise. So is it time for the UN to step in to resolve South Sudan's conflict? A question Newsday's Julian Keane put to Ambassador Princeton Lyman, former United States special envoy for Sudan and South Sudan between 2011 and 2013. (Photo: makeshift graves next to the United Nations Mission in South Sudan in the Jebel area in Juba on July 22, 2016. Credit: Charles Atiki Lomodon/AFP/Getty Images).
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