Very serious challenges remain "on the ground" in South Sudan which are preventing the United Nations from carrying out its work effectively. That's the assessment of El Ghassim Wane, a senior UN peacekeeping official who is currently in the African country. South Sudan is recovering from almost three years of internal conflict which has led to the deaths of tens of thousands of people and forced some 2 point 6 million to flee their homes. The UN Security Council has called for the free movement of personnel working for the mission there, UNMISS, and for the establishment of a regional protection force. Sebit William asked Wane what he had achieved during his visit.