On August 19, 1991, Gorbachev's vice president, Gennady Yanayev, Prime Minister Valentin Pavlov, Defense Minister Dmitry Yazov, KGB chief Vladimir Kryuchkov and other senior officials acted to prevent the union treaty from being signed by forming the "General Committee on the State Emergency", which put Gorbachev – on holiday in Foros, Crimea – under house arrest and cut off his communications.
Faced with growing separatism, Gorbachev sought to restructure the Soviet Union into a less centralized state. On August 20, 1991, the Russian SFSR was scheduled to sign a New Union Treaty that would have converted the Soviet Union into a federation of independent republics with a common president, foreign policy and military. It was strongly supported by the Central Asian republics, which needed the economic advantages of a common market to prosper.
In August 1991, the Battle of Vukovar began. The Battle of Vukovar was an 87-day siege of Vukovar in eastern Croatia by the Yugoslav People's Army (JNA), supported by various paramilitary forces from Serbia, between August and November 1991. Before the Croatian War of Independence the Baroque town was a prosperous, mixed community of Croats, Serbs and other ethnic groups. As Yugoslavia began to break up, Serbia's President Slobodan Milošević and Croatia's President Franjo Tuđman began pursuing nationalist politics. In 1990, an armed insurrection was started by Croatian Serb militias, supported by the Serbian government and paramilitary groups, who seized control of Serb-populated areas of Croatia. The JNA began to intervene in favour of the rebellion, and conflict broke out in the eastern Croatian region of Slavonia in May 1991. In August, the JNA launched a full-scale attack against Croatian-held territory in eastern Slavonia, including Vukovar.
The Arbitration Commission of the Peace Conference on Yugoslavia, also referred to as Badinter Arbitration Committee, was set up by the Council of Ministers of the European Economic Community (EEC) on August 27, 1991, to provide the Conference on Yugoslavia with legal advice.