U.S. proposes U.N. arms embargo on South Sudan, sanctions

By Michelle Nichols UNITED NATIONS (Reuters) - The United States circulated on Thursday to the 15-member United Nations Security Council a draft resolution to impose an arms embargo on South Sudan and further targeted sanctions amid warnings by a senior U.N. official of possible genocide. Political rivalry between South Sudan's President Salva Kiir, an ethnic Dinka, and his former deputy Riek Machar, a Nuer, led to civil war in 2013 that has often followed ethnic lines. The pair signed a shaky p