Potential enlargement of the European Union

There are eight recognised candidates for membership of the European Union: Turkey (since 1999), North Macedonia (2005), Montenegro (2010), Serbia (2012), Albania (2014), Moldova (2022), Ukraine (2022), and Bosnia and Herzegovina (2022). Kosovo (whose independence is not recognised by five EU member states) and Georgia formally submitted applications for membership in 2022 and are considered potential candidates by the European Union.[1][2]

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Montenegro and Serbia, the most advanced candidates, are expected to join earlier than the others.[3] Due to multiple factors, talks with Turkey are at an effective standstill.[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members, Norway, Switzerland and Iceland have submitted membership applications in the past but subsequently frozen or withdrawn them, while the United Kingdom is a former member.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.