For instance, for what the UN and NATO are worth, Kosovo had the sanction of both.
From an interesting piece by Michael Parenti, "The Rational Destruction of Yugoslavia":
The dismemberment and mutilation of Yugoslavia was part of a concerted policy initiated by the United States and the other Western powers in 1989. Yugoslavia was the one country in Eastern Europe that would not voluntarily overthrow what remained of its socialist system and install a free-market economic order. In fact, Yugoslavs were proud of their postwar economic development and of their independence from both the Warsaw Pact and NATO. The U.S. goal has been to transform the Yugoslav nation into a Third-World region, a cluster of weak right-wing principalities....
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U.S. policymakers also want to abolish Yugoslavia's public sector services and social programs -- for the same reason they want to abolish our public sector services and social programs. The ultimate goal is the privatization and Third Worldization of Yugoslavia, as it is the Third Worldization of the United States and every other nation. In some respects, the fury of the West's destruction of Yugoslavia is a backhanded tribute to that nation's success as an alternative form of development, and to the pull it exerted on neighboring populations both East and West.
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That U.S. leaders have consciously sought to dismember Yugoslavia is not a matter of speculation but of public record. In November 1990, the Bush administration pressured Congress into passing the 1991 Foreign Operations Appropriations Act, which provided that any part of Yugoslavia failing to declare independence within six months would lose U.S. financial support. The law demanded separate elections in each of the six Yugoslav republics, and mandated U.S. State Department approval of both election procedures and results as a condition for any future aid. Aid would go only to the separate republics, not to the Yugoslav government, and only to those forces whom Washington defined as "democratic," meaning right-wing, free-market, separatist parties.
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One of the great deceptions, notes Joan Phillips, is that "those who are mainly responsible for the bloodshed in Yugoslavia -- not the Serbs, Croats or Muslims, but the Western powers -- are depicted as saviors." While pretending to work for harmony, U.S. leaders supported the most divisive, reactionary forces from Croatia to Kosovo.
In Croatia, the West's man-of-the-hour was Franjo Tudjman, who claimed in a book he authored in 1989, that "the establishment of Hitler's new European order can be justified by the need to be rid of the Jews," and that only 900,000 Jews, not six million, were killed in the Holocaust. Tudjman's government adopted the fascist Ustasha checkered flag and anthem. Tudjman presided over the forced evacuation of over half a million Serbs from Croatia between 1991 and 1995, replete with rapes and summary executions. This included the 200,000 from Krajina in 1995, whose expulsion was facilitated by attacks from NATO war planes and missiles. Needless to say, U.S. leaders did nothing to stop and much to assist these atrocities, while the U.S. media looked the other way. Tudjman and his cronies now reside in obscene wealth while the people of Croatia are suffering the afflictions of the free market paradise. Tight controls have been imposed on Croatian media, and anyone who criticizes President Tudjman's government risks incarceration. Yet the White House hails Croatia as a new democracy.
http://www.michaelparenti.org/yugoslavia.html