Sudan and South Sudan are teetering on the brink of all-out war from which neither would benefit. Increasingly angry rhetoric, support for each other’s rebels, poor command and control, and brinkmanship, risk escalating limited and contained conflict into a full-scale confrontation between the Sudanese Armed Forces (SAF) and the Sudan Peoples’ Liberation Army. Diplomatic pressure to cease hostilities and return to negotiations must be exerted on both governments by the region and the United Nations Security Council, as well as such partners as the U.S., China and key Gulf states. The immediate priority needs to be a ceasefire and security deal between North and South, as well as in Southern Kordofan and Blue Nile. But equally important, for the longer-term, are solutions to unresolved post-referendum issues, unimplemented provisions of the Comprehensive Peace Agreement [that ended the civil war in 2005], and domestic reforms in both countries.