Biden became interested in the Yugoslav Wars after hearing about Serb abuses during the Croatian War of Independence in 1991. Once the Bosnian War broke out, Biden was among the first to call for the "lift and strike" policy of lifting the arms embargo, training Bosnian Muslims and supporting them with NATO air strikes, and investigating war crimes. The George H. W. Bush administration and Clinton administration were both reluctant to implement the policy, fearing Balkan entanglement. In April 1993, Biden spent a week in the Balkans and held a tense three-hour meeting with Serbian leader Slobodan Milošević. Biden related that he had told Milošević, "I think you're a damn war criminal and you should be tried as one."