U.S. envoy urges Yugoslav president to let aid workers in Kosovo A Serb police officer scans the area near a checkpoint in Komorane, near Pristina, the capital of Yugoslavia's Kosovo Province, Friday. U.S. envoy Christopher Hill urged Yugoslav President Slobodan Milosevic to allow aid workers to deliver food, medicine and blankets to tens of thousands of ethnic Albanians who fled into the hills to escape a government attack.