In May 1994, after Serb forces invaded safe zones established by the United Nations Protection Force, Clinton authorized air strikes against Serb positions. The air strikes did not end Serb advances, and in July 1995 over 8,000 Bosniaks were killed in the Srebrenica massacre. Clinton and National Security Adviser Anthony Lake formulated a plan to end the genocide in Bosnia, with the key part of the plan being a major NATO air campaign against the Bosnian Serbs. After Clinton won the support of European leaders for the campaign, NATO launched Operation Deliberate Force. In reaction to bombing campaign and the advance of Bosniak forces, Milošević agreed to begin peace talks. Clinton sponsored the talks in Dayton Ohio, putting Richard Holbrooke in charge. The subsequent Dayton Agreement ended the Bosnian War and divided Bosnia into two autonomous regions.