On 9 January 2005, the government signed the Nairobi Comprehensive Peace Agreement with the Sudan People's Liberation Movement (SPLM) with the objective of ending the Second Sudanese Civil War.  The United Nations Mission in Sudan (UNMIS) was established under the UN Security Council Resolution 1590 to support its implementation. The peace agreement was a prerequisite to the 2011 referendum: the result was a unanimous vote in favour of secession of South Sudan; the region of Abyei will hold its own referendum at a future date.