On the Sudan civil war front, the government is trying to draw a hard boundary around a shrinking but still critical part of the oil system. As fighting between the Sudanese Armed Forces and the Rapid Support Forces, a paramilitary group, continues across much of the country, Khartoum is insisting that the Heglig oil field remains operational and under state control, even as regional actors tighten scrutiny on the RSF’s external supply lines. Heglig’s importance is often overstated in volume terms. Most of the crude that matters economically…