Snag in Kosovo talks over setting cease-fire.

Reports threats to talks aimed at ending the fighting in Serbia's Kosovo province between Serbians and ethnic Albanians. Possible last chance to avoid an all-out war in the region; Peace proposal by the United States and its partners; Threatened airstrikes by the North Atlantic Treaty Organization (NATO) against the Serbs; Views of the Kosovo Liberation Army (KLA); Timetable for an agreement; Demands of Albanian delegates.