Potential enlargement of the European Union

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There are currently nine states recognized as candidates for membership of the European Union: Albania, Bosnia and Herzegovina, Georgia, Moldova, Montenegro, North Macedonia, Serbia, Turkey, and Ukraine.^[1] Kosovo (the independence of which is not recognised by five EU member states) formally submitted its application for membership in 2022 and is considered a potential candidate by the European Union. Due to multiple factors, talks with Turkey are at an effective standstill since December 2016.^[2]

Six candidates are currently engaged in active negotiations: Montenegro (since 2012), Serbia (since 2014), Albania (since 2020), North Macedonia (since 2020), Moldova and Ukraine (since 2024). The most advanced stage of the negotiations, defined as meeting the interim benchmarks for negotiation chapter 23 and 24 which allow the closing process of all negotiation chapters to start, has so far only been reached by Montenegro.^[3] Montenegro's declared political goal is to achieve membership of the EU by 2028.^[4]

The accession criteria are included in the Copenhagen criteria, agreed in 1993, and the Treaty of Maastricht (Article 49). Article 49 of the Maastricht Treaty (as amended) says that any "European state" that respects the "principles of liberty, democracy, respect for human rights and fundamental freedoms, and the rule of law", may apply to join the EU. Whether a country is European or not is subject to political assessment by the EU institutions.^[5] Past enlargement since the foundation of the European Union as the European Economic Community by the Inner Six states in 1958^[6] brought total membership of the EU to twenty-eight, although as a result of the withdrawal of the United Kingdom, the current number of EU member states is twenty-seven.

Of the four major western European countries that are not EU members, Norway, Switzerland and Iceland have submitted membership applications in the past but subsequently frozen or withdrawn them, while the United Kingdom is a former member. Norway, Switzerland, Iceland, as well as Liechtenstein, participate in the EU Single Market and also in the Schengen Area, which makes them closely aligned with the EU; none, however, are in the EU Customs Union.