The treaty introduces an exit clause for members who wish to withdraw from the Eu. 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 region is no longer part of the Community, such as. B Greenland in 1985, when no Member State had left the Community at the time of ratification of the Lisbon Treaty. Before the Lisbon Treaty came into force, it was not clear whether a Member State had a legal right to leave the EU. On 30 March 2017, the United Kingdom announced its intention to leave the European Union.  After negotiating a Brexit withdrawal agreement, the UK left the EU on 31 January 2020. Following the June negotiations and the final settlement on a 16-part framework for the new reform treaty, the Intergovernmental Conference on the development of the new treaty began on 23 July 2007. The Intergovernmental Conference opened after a brief ceremony. The Portuguese Presidency presented a 145-page document (with an additional 132 pages, with 12 protocols and 51 declarations), entitled draft treaty amending the Treaty on the European Union and the Treaty establishing the European Community, and presented it as a starting point for the development process on the Council of Ministers website. 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 need for a revision of the EU`s constitutional framework, particularly in view of the accession of ten new Member States in 2004, was underlined in a declaration annexed to the Treaty of Nice in 2001. The Nice agreements had paved the way for a further enlargement of the Union through a reform of voting procedures. In the December 2001 Laeken Declaration, the EU pledged to improve democracy, transparency and efficiency and defined the process that could constitute a constitution to achieve these goals. Created under the presidency of former French President Valéry Giscard d`Estaing, the European Convention was tasked with providing as comprehensive advice as possible throughout Europe in order to draft a first draft constitution. The final text of the constitutional proposal was adopted at the summit on 18-19 June 2004, under the Irish Presidency. Before the opening of the IGC, the Polish government expressed a desire to renegotiate the June agreement, particularly on the voting system, but gave in under political pressure from most other Member States because it did not want to be seen as the only troublemaker in the negotiations.  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.