Serbian police and military counter-action against the pro-Albanian separatist Kosovo Liberation Army in Serbia's previously autonomous province of Kosovo culminated in escalating armed conflict in 1998 and NATO air strikes against Yugoslavia between March and June 1999, ending in full withdrawal of Yugoslav security forces from the province and deployment of international civil and security forces. Milošević was indicted on 24 May 1999 for war crimes and crimes against humanity committed in Kosovo, and he was standing trial, up until his death, at the International Criminal Tribunal for the Former Yugoslavia (ICTY). He asserted that the trial was illegal, having been established in contravention of the UN Charter.