In the 1980s the political situation in Yugoslavia deteriorated with national tension fanned by the 1986 Serbian SANU Memorandum and the 1989 coups in Vojvodina, Kosovo and Montenegro. In January 1990, the Communist Party fragmented along national lines, with the Croatian faction demanding a looser federation. In the same year, the first multi-party elections were held in Croatia, with Franjo Tuđman's win raising nationalist tensions further. The Serbs in Croatia, intent on achieving independence from Croatia, left the Sabor and declared the autonomy of areas that would soon become the unrecognized self-declared Republic of Serbian Krajina (RSK). As tensions rose, Croatia declared independence in June 1991; however the declaration came into effect on 8 October 1991. Tensions escalated into the Croatian War of Independence when the Yugoslav National Army and various Serb paramilitaries attacked Croatia. By the end of 1991, a high intensity war fought along a wide front reduced Croatia to controlling about two-thirds of its territory.