promises has been questioned by some observers, however, and the status of three central and eastern provinces was a point of contention in the negotiations. Some observers wondered whether hard line elements in the north would allow the treaty to proceed. A final peace treaty was signed on 9 January 2005 in Nairobi. The terms of the peace treaty are as follows: The south will have autonomy for six years, followed by a referendum on secession. Both sides of the conflict will merge their armed forces into a 39,000-strong force after six years, if the secession referendum should turn out negative. Income from oilfields is to be shared evenly between north and south. Jobs are to be split according to varying ratios (central administration: 70 to 30, Abyei/Blue Nile State/Nuba mountains: 55 to 45, both in favour of the government). Islamic law is to remain in the north, while continued use of the sharia in the south is to be decided by the elected assembly. On 31 August 2006, the United Nations Security Council approved Resolution 1706 to send a new peacekeeping force of 17,300 to Darfur. In the following months, however, UNMIS was not able to deploy to Darfur due to the Government of the Sudan's steadfast opposition to a peacekeeping operation undertaken solely by the United Nations. The UN then embarked on an alternative, innovative approach to try to begin stabilize the region through the phased strengthening of AMIS, before transfer of authority to a joint African Union/United Nations peacekeeping operation. Following prolonged and intensive negotiations with the Government of the Sudan and significant international pressure, the Government of the Sudan finally accepted the peacekeeping operation in Darfur. In 2009 the International Criminal Court issued an arrest warrant for al-Bashir, accusing him of crimes against humanity and war crimes. In 2009 and 2010 a series of conflicts between rival nomadic tribes in South Kordofan caused a large number of casualties and displaced thousands. An agreement for the restoration of harmony between Chad and Sudan, signed January 15, 2010, marked the end of a five-year war between them. The Sudanese government and the JEM signed a ceasefire agreement ending the Darfur conflict in February, 2010. In January 2011 referendum on independence for Southern Sudan was held, and the South voted overwhelmingly to secede later that year as the Republic of South Sudan, with its capital at Juba and Kiir