**FILE**-Army troops march during exercise code named „Return 2000, in the village of Petlovo Bojiste, Serbia, some 300 km south of Belgrade, Friday, Sept. 1, 2000. Serbia on Friday, Aug. 17, 2007 urged the return of its army and police to Kosovo, a move that could increase ethnic tensions in the breakaway province. Aleksandar Simic, a spokesman for Serbia’s Prime Minister Vojislav Kostunica, said „the time has come for the return“ of some 1,000 Serbian security personnel to the province, where 90 percent of the 2 million people are ethnic Albanians. (AP Photo/Srdjan Ilic)