The Lisbon Treaty (originally known as the Reform Treaty) is an international agreement that amends the two treaties that form the constitutional basis of the European Union (EU). The Lisbon Treaty was signed by member states on 13 December 2007 and came into force on 1 December 2009.  It amends the Maastricht Treaty (1992), called the Treaty on the European Union (2007) or kills it in an updated form, and the Treaty of Rome (1957), which is called, in an updated form, the Treaty on the Functioning of the European Union (2007) or the Treaty on the TFUE.  In addition, the protocols attached to the treaty and the Treaty establishing the European Atomic Energy Community (EURATOM) are being amended. The agreement was reached on a 16-page mandate for an intergovernmental conference that proposed to remove much of the constitutional terminology and many symbols of the old text of the European Constitution. In addition, it was agreed to recommend that the Intergovernmental Conference amend the provisions of the old European Constitution on certain key aspects (for example. B, voting or foreign policy). Under pressure from the United Kingdom and Poland, it was also decided to add a protocol to the Charter of Fundamental Rights of the European Union (and to clarify that it did not extend the rights of the courts to overturn national law in Britain or Poland). The specific amendments included a greater possibility of opt-out in certain areas of the legislation and that the proposed new voting system, which was part of the European Constitution, would not be implemented until 2014 (see provisions below).  Parliament has used its increased powers in terms of legislation, but also, for example, the appointment of the Commission, to obtain new privileges from President Barroso and has used its budgetary powers as a veto on the creation of the External Action Service.  It also used its new power over international agreements to quickly block the SWIFT agreement on data exchange with the United States and threatened to conclude a free trade agreement with South Korea.  The Treaty introduces an exit clause for members who wish to withdraw from the Union.
The procedure is thus formalised by finding that a Member State must inform the European Council before it can end its accession and a withdrawal agreement would then be negotiated between the Union and that State, the treaties no longer apply to that State from the date of the agreement or, if not, within two years of notification. There have been several cases where a territory is no longer part of the Community, for example.B.