"The Secretary-General takes note of the outcome of the last round of negotiations between President Salva Kiir and former Vice-President Dr. Riek Machar, as reflected in the agreement they signed in Addis-Ababa on 2 February 2015. He regrets that neither of them compromised on a mutually acceptable power-sharing formula," the UN said in a statement published on its website.
Kiir will reportedly keep the president's post, while Machar will hold his former position as deputy president. At the same time, the warring factions are yet to decide upon the distribution of positions in the government.
Both the South Sudan government and the opposition groups decided to conclude a comprehensive agreement before March 5.
Violence erupted in South Sudan in December, 2013, when president Salva Kiir accused Riek Machar of plotting a coup. Thousands of people have been killed in the ongoing civil war in the country.
