The territory of Eastern Slavonia, Baranja and Western Sirmium had previously been controlled by the RSK, and before that by the SAO Eastern Slavonia, Baranja and Western Syrmia. The agreement was acknowledged by the United Nations Security Council Resolution 1023, and it paved the way to the establishment of the United Nations Transitional Authority for Eastern Slavonia, Baranja and Western Sirmium. UNTAES was not designed as an ordinary UN mission but rather as an transitional administration, partially modeled on the United Nations Transitional Authority in Cambodia, therefore providing the UNTAES with direct and supreme governing mandate over the region which was an effective United Nations protectorate.