evidence: Bilateral relations between South Sudan and the Sudan were officially started on 9 July 2011 following South Sudan's independence. Sudan became the first country in the world to recognize the independence of South Sudan. However, relations between South Sudan and Sudan have still been poor, with both sides supporting rebel groups in the other's territory. [...] Kafia Kingi [edit]Kafia Kingi is a South Sudan sovereign territory according to the authoritative 2005 Comprehensive Peace Agreement signed by both states, the UN, and Colin Powell representing the US, but has largely been controlled ever since then by Sudanese forces. The binding 2005 agreement specifies use of the 1 January 1956 boundary. Kafia Kingi was not transferred to Darfur in the north until 1960. [...] - ^ "South Sudan in Ethiopia-Djibouti oil pipeline deal". BBC News. 9 February 2012.