 Complete the following phrase:  Albanian opposition to the sovereignty of Yugoslavia and especially Serbia had previously surfaced in rioting 1968 and March 1981 in the capital Pristina. Rugova initially advocated non-violent resistance, but later opposition took the form of separatist agitation by opposition political groups and armed action from 1996 by the Kosovo Liberation Army Ushtria Çlirimtare e Kosovës, or UÇK whose activities led to the Kosovo War ending with the 