South Sudan’s warring parties began talks Friday with mediators in Ethiopia, as both sides ignored calls for a cease-fire. Negotiators met separately with representatives from the regional trade block, known as the Inter-Governmental Authority on Development, or IGAD in Addis Ababa. These preliminary talks aim to narrow differences that have led to clashes killing more than 1,000 people and displacing nearly 200,000. The mediators hope both sides of the conflict can hold direct talks on Saturday, according to a spokesman for Ethiopia’s foreign ministry, Dina Mufti. The modest beginning marks a breakthrough for African-led efforts to end more than two weeks of fighting in the world’s youngest nation. The conflict—which pits the country’s President Salva Kiir, against his former deputy, Riek Machar —threatens to render South Sudan along ethnic lines and upend its oil industry. Energy exports account for nearly all of South Sudan’s exports and foreign revenue. […]