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The Quartet on the Middle East or Middle East Quartet, sometimes called the Diplomatic Quartet or Madrid Quartet or simply the Quartet, is a foursome of nations and international and supranational entities involved in mediating the peace process in the Israeli-Palestinian conflict. The Quartet are the United Nations, the United States, the European Union, and Russia. The group was established in Madrid in 2002, recalling Madrid Conference of 1991, as a result of the escalating conflict in the Middle East. Tony Blair is the Quartet's current Special Envoy. (via Freebase)