UN Secretary-General Kofi Annan on Tuesday characterised as not "entirely positive" Sudan's decision to expel African Union peacekeepers from Darfur if their mission is placed under UN control. A US and British-backed United Nations resolution, which passed last Thursday and was immediately rejected by Khartoum, says 20,000 UN troops should take over peacekeeping duties from AU forces, which have been unable to end the violence that has ravaged Darfur for 3-1/2 years. AU troops were to fill the gap until the arrival of the UN troops and be absorbed into the UN operation.