The Z-4 Plan or Draft agreement on the Krajina, Slavonia, Southern Baranja and Western Sirmium stands for the Zagreb 4 peace proposal to end the Croatian War of Independence. The proposal was made by the Zagreb 4 group (also known as the Mini-Contact Group) and would have reintegrated the Republic of Serbian Krajina into Croatia. The Zagreb 4 group consisted of the United States (through former Secretary of State Cyrus Vance), Russia, and the European Union (though France and Germany). Their plan was never implemented due to the onset of Operation Storm, a military operation in which Croatia defeated the Krajina Serbs and captured its territory.