Uganda has deployed special forces to South Sudan amid escalating tensions between South Sudan’s President Salva Kiir and First Vice President Riek Machar over a collapsing power-sharing deal. That 2018 agreement ended a five-year civil war that killed some 400,000 people. Deadly clashes by armed groups have been mounting, many centered in Upper Nile state. The U.N. has urged South Sudan’s leaders “to resolve tensions through dialogue.”