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Stephen Sackur talks to the president of South Sudan, Salva Kiir Mayardit, in Juba.

The world's youngest nation, in December 2013 South Sudan became engulfed in a civil conflict which has claimed thousands of lives and prompted fears it could lead to genocide. A fragile ceasefire was agreed between the government of President Salva Kiir and his former deputy Riek Machar, who has led the rebel forces.