In December 2013 South Sudan, the world’s youngest nation, 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 just over a week ago between the government of President Salva Kiir and his former deputy Riek Machar, who has led the rebel forces, but will it hold? In a Hardtalk exclusive, Stephen Sackur talks to President Salva Kiir in Juba.(Photo: South Sudan's President Salva Kiir sits after he signed a peace agreement with rebel leader Riek Machar. Credit: Reuters)