The United Nations administrator for Kosovo arrived in Belgrade Monday for a day of talks with high-ranking Serbian politicians on some 3,000 people still missing five years after the Kosovo war. Soren Jessen-Petersen is scheduled to meet Serbian President Boris Tadic, Prime Minister Vojislav Kostunica and special coordinator for Kosovo-related affairs Nebojsa Covic. Belgrade authorities announced that talks with Jessen-Petersen would also include other humanitarian issues, including the decentralization of the province and the blackout imposed by the local electricity company on several Serb villages in the area. Diplomacy concerning Kosovo - under international administration since 1999 - is expected to reach a high point in the summer of 2005, when negotiations on the final status of the troubled territory are due to begin.