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 ceasefire has been agreed between the government of President Salva Kiir and his former deputy Riek Machar, who has led the rebel forces, but the agreement is already looking shaky. Stephen Sackur talks to Riek Machar in Addis Ababa.(Photo: Riek Machar. Credit: AFP/Getty Images)