Ex-Yugoslav Head Milosevic Begins Defense THE HAGUE, Netherlands - Former Yugoslav President Slobodan Milosevic opened his long-delayed defense at the Yugoslav war crimes tribunal Tuesday, describing the battles of his Serbian people as self defense against internal rebellions and external attacks by Islamic warriors.    Milosevic, charged with genocide and crimes against humanity in the Balkans, portrayed the Serbs as victims rather than aggressors: victims of a plan supported by the United States and Europe to break up Yugoslavia, of an attempt to wipe out Croatia's Serb minority, and of a Saudi-financed plot to create an Islamic state in Bosnia...