ONU irashaka kwohereza muri Sudani yepfo abandi basirikare ibihumbi bine bo kurinda abaturage b'abasivile no kurinda umutekano w'umurwa mukuru Juba nyuma y'imirwano iherutse hagati y'abayoboke ba Perezida Salva Kiir n'umwungirije Riek Machar.
