Machar should not return to previous position in South Sudan -U.S. official

By Patricia Zengerle WASHINGTON (Reuters) - The United States does not believe South Sudan's former Deputy President Riek Machar should return to his former position in its government, given continuing instability in the country, Washington's special envoy for South Sudan said on Wednesday. Nearly three years ago political rivalry between South Sudanese President Salva Kiir, an ethnic Dinka, and his former deputy Machar, a Nuer, sparked a civil war that has often followed ethnic lines. The pair