Enlargement According to the
Copenhagen criteria, membership of the European Union is open to any European country that is a stable,
free-market liberal democracy that respects the
rule of law and human rights. Furthermore, it has to be willing to accept all the obligations of membership, such as adopting all previously agreed law (the 170,000 pages of
acquis communautaire) and switching to the
euro. For a state to join the European Union, the prior approval of all current member states is required. In addition to enlargement by adding new countries, the EU can also expand by having territories of member states, which are outside the EU, integrate more closely (for example in respect to the
dissolution of the Netherlands Antilles) or by a territory of a member state which had previously seceded and then rejoined (see withdrawal below).
Suspension There is no provision to expel a member state, but
TEU Article 7 provides for the suspension of certain rights. Introduced in the
Treaty of Amsterdam, Article 7 outlines that if a member persistently breaches the EU's founding principles (liberty, democracy, human rights and so forth, outlined in
TEU Article 2) then the
European Council can vote to suspend any rights of membership, such as voting and representation. Identifying the breach requires unanimity (excluding the state concerned), but sanctions require only a qualified majority. The state in question would still be bound by the obligations treaties and the Council acting by majority may alter or lift such sanctions. The
Treaty of Nice included a preventive mechanism whereby the council, acting by majority, may identify a potential breach and make recommendations to the state to rectify it before action is taken against it as outlined above.
Withdrawal Prior to the
Lisbon Treaty, there was no provision or procedure within any of the
Treaties of the European Union for a member state to withdraw from the
European Union or its predecessor organisations. The Lisbon Treaty changed this and included the first provision and procedure of a member state to leave the bloc. The procedure for a state to leave is outlined in
TEU Article 50 which also makes clear that "Any Member State may decide to withdraw from the Union in accordance with its own constitutional requirements". Although it calls for a negotiated withdrawal between the seceding state and the rest of the EU, if no agreement is reached two years after the seceding state notifying of its intention to leave, it would cease to be subject to the treaties anyway (thus ensuring a right to unilateral withdrawal). After an extended period of negotiation and internal political debate the UK eventually withdrew from the EU on 31 January 2020. Prior to 2016, no member state had voted to withdraw. However,
French Algeria,
Greenland and
Saint-Barthélemy did cease being part of the EU (or its predecessor) in 1962, 1985, and 2012, respectively, due to status changes. The situation of Greenland being outside the EU while still subject to an EU member state had been discussed as a template for the pro-EU regions of the UK remaining within the EU or its single market. Beyond the formal withdrawal of a member state, there are a number of independence movements such as
Catalonia or
Flanders which could result in a situation similar to Greenland's. Were a territory of a member state to secede but wish to remain in the EU, some scholars claim it would need to reapply to join as if it were a new country applying from scratch. However, other studies claim internal enlargement is legally viable if, in case of a member state dissolution or secession, the resulting states are
all considered
successor states. There is also a
European Citizens' Initiative that aims at guaranteeing the continuity of rights and obligations of the European citizens belonging to a new state arising from the democratic secession of a European Union member state. ==Representation==