People can debate the foolishness of that order all they want. But it is false to claim that Clark gave an order to open fire, and I'm sure you know that.
No, the Russian paratroopers were already there:
"In Waging Modern War, General Clark wrote about his fury upon learning that Russian peacekeepers had entered the airport at Pristina, Kosovo, before British or American forces. In the article "The guy who almost started World War III," (Aug. 3, 1999), The Guardian (U.K.) wrote, "No sooner are we told by Britain's top generals that the Russians played a crucial role in ending the West's war against Yugoslavia than we learn that if NATO's supreme commander, the American General Wesley Clark, had had his way, British paratroopers would have stormed Pristina airport, threatening to unleash the most frightening crisis with Moscow since the end of the Cold War." "I'm not going to start the third world war for you," General Sir Mike Jackson, commander of the international KFOR peacekeeping force, is reported to have told Gen. Clark " http://www.antiwar.com/orig/jatras12.html
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