Kosovo's constitutional status of the period June 1999-February 2008 was established by the United Nations in UN Security Council Resolution (UNSCR) 1244, adopted on 10 June 1999. The Security Council placed Kosovo under the temporary administration of the United Nations Mission in Kosovo (UNMIK), under the leadership of a Special Representative of the Secretary General. It also explicitly upheld the existing sovereignty of Serbia over Kosovo, "reaffirming the commitment of all Member States to the sovereignty and territorial integrity of the Federal Republic of Yugoslavia and the other States of the region, as set out in the Helsinki Final Act and annex 2 Finnish-Russian proposals." It also established a requirement that the post-conflict status process must take full account of "the principles of sovereignty and territorial integrity of the Federal Republic of Yugoslavia."