Three years into the country’s catastrophic civil war, Sudan’s patchwork of battlefields has hardened into something that resembles a de facto partition. General Abdel Fattah al-Burhan’s Sudanese Armed Forces has consolidated its control over much of northern, eastern, and central Sudan, and the Rapid Support Forces, led by Mohamed Hamdan Dagalo (known as Hemedti), dominates Darfur in the west and much of the Kordofan region in the country’s center. The factions have each established rival governments—the SAF’s between Port Sudan and Khartoum and the RSF’s in Nyala, in south Darfur—and diverging economies.…