Currently, all of the European microstates have some form of relations with the European Union (EU).
Andorra, Liechtenstein, Monaco, San Marino, and the Vatican City remain outside the Union. Andorra is, by population, the largest of the five microstates with around 85,500 citizens according to a 2022 estimate. Two other small countries, Luxembourg and Malta, are full members of the EU and both inhabited by populations over 600,000 and over 500,000 respectively.
The euro convergence criteria (also known as the Maastricht criteria) are the criteria European Union member states are required to meet to enter the third stage of the Economic and Monetary Union (EMU) and adopt the euro as their currency. The four main criteria, which actually comprise five criteria as the "fiscal criterion" consists of both a "debt criterion" and a "deficit criterion", are based on Article 140 (ex article 121.1) of the Treaty on the Functioning of the European Union.
Full EMU membership is only open to EU member states. However, the European microstates of Andorra, Monaco, San Marino and the Vatican City, which are not members of the EU, have signed monetary agreements with the EU which allow them officially to adopt the euro and issue their own variant of euro coins. These states had all previously used one of the eurozone currencies replaced by the euro, or a currency pegged to one of them. These states are not members of the eurozone and do not get a seat in the European Central Bank (ECB) or the Eurogroup.
Greater Europe refers to the idea of an extended Europe that generally implies a Europe transcending traditional geographic boundaries to include trans-Eurasian countries, or countries in close proximity to Continental Europe with strong political, economic, or cultural links to Europe.
The European Neighbourhood Policy (ENP) is a foreign relations instrument of the European Union (EU) which seeks to tie those countries to the east and south of the European territory of the EU to the Union. These countries include some who seek to one day become either a member state of the European Union, or become more closely integrated with the European Union. The ENP does not apply to neighbours of the EU's outermost regions, specifically France's territories in South America, but only to those countries close to EU member states' territories in mainland Europe.
The countries covered are Algeria, Egypt, Israel, Jordan, Lebanon, Libya, Morocco, Palestine, Syria, Tunisia in the South; and Armenia, Azerbaijan, Belarus, Georgia, Moldova, Ukraine in the East. Russia has a special status with the EU-Russia Common Spaces instead of ENP participation. The EU offers financial assistance to countries within the European Neighbourhood, so long as they meet the strict conditions of government reform, economic reform and other issues surrounding positive transformation. This process is normally underpinned by an Action Plan agreed by Brussels and the target country. The ENP does not cover countries in the current EU enlargement agenda, the European Free Trade Association or the western European microstates.