Diagram showing the rotating Presidencies of the Council of Western European Union (WEU) and of the Council of the European Union (EU) from 1999 to 2012. In accordance with the Protocol on Article 17 of the EU Treaty, annexed to the EU Treaty by the 1997 Treaty of Amsterdam, the WEU Council, meeting in Erfurt on 18 November 1997, approves the harmonisation of the sequence of Presidencies of the WEU and EU Councils. Since 1 January 1999, when the Presidency of the EU Council is held by a full Member State of WEU, this country also holds the Presidency of the WEU Council.