Eastern Slavonia, Baranja, and Western Syrmia was formed out of the only part of the rebel Republic of Serbian Krajina (RSK) that was not overrun by Croatian government forces in August 1995. After Operation Storm in August 1995, by which the majority of the Republic of Serbian Krajina was restored to Croatian control, Eastern Slavonia, Baranja and Western Syrmia became a "de facto" self-governing territory. Immediately upon completion of Operation Storm, U.S. President Bill Clinton, within the framework of an initiative to end the war in Bosnia, said that there must be ""...a long-term plan for a sustainable solution to the situation in Eastern Slavonia ... based on Croatian sovereignty and the principles outlined in the Z-4 plan"". Croatia in this period hesitated between a diplomatic or military solution, but due to strong pressure from the international community, the possibility of military intervention was rejected. In November 1995, local Serb leaders signed the Erdut Agreement, by which the eventual re-integration of this region into Croatia was agreed-upon. The Erdut agreement was reached as part of negotiations at the Dayton Agreement conference. Nevertheless, as of 2007 the Croatian negotiating team had not accepted the Z-4 plan proposed by President Bill Clinton as a basis for negotiations.