The peace deal struck in Naivasha, Kenya in 2005 between Sudan’s government and rebels from the Sudanese People’s Liberation Movement (SPLM) committed both sides, at war for most of the previous 50 years, to work for unity. But, as the so-called Comprehensive Peace Agreement (CPA) reaches its climax, the SPLM, based in the autonomous region of South Sudan, has abandoned all pretense that unity with the North and the government in Khartoum is either possible or desirable.