NATO historically fought Bosnian-Serbian forces during the Bosnia war and intervened in 1999 in the Kosovo War by bombing targets in Serbia (then part of FR Yugoslavia). After the overthrow of President Slobodan Milošević, Serbia wanted to improve its relations with NATO. Though a future membership in the military alliance was highly controversial, because among political parties and society there were still resentments due to NATO's air campaign from 1999. In the years under Prime Minister Zoran Đinđić the country (then Serbia and Montenegro) did not rule out joining NATO. But after Đinđić's assassination in 2003, Belgrade increasingly started preferring a course of military neutrality (officially declared in 2007).