United Nations Security Council Resolution 1997, adopted unanimously on July 11, 2011, after recalling resolutions 1590 (2005), 1627 (2005), 1663 (2006), 1706 (2006), 1709 (2006), 1714 (2006), 1755 (2007), 1812 (2008), 1870 (2009), 1919 (2010) and 1978 (2011) on the situation in Sudan, the Council authorised the withdrawal of the United Nations Mission in Sudan (UNMIS) by August 31, 2011.[1]