
According to the Treaty on European Union, any European country may apply for membership if it respects the principles of liberty, democracy, respect for human rights and fundamental freedoms, and the rule of law. Accession, however, can only follow if the given European country fulfils all criteria of accession, also known as the Copenhagen Criteria, which were fixed by the European Council in Copenhagen in 1993:
The Copenhagen criteria were reinforced by the European Council in Madrid in 1995, with a further one added:
In addition, the EU must be able to absorb new members, so it reserves the right to decide when it will be ready to accept them.
The pre-accession strategy is designed to prepare the candidate countries for future membership. It encompasses the following frameworks and mechanisms:
The Commission keeps the Council and the Parliament duly informed about the candidates' preparations for membership with the help of “Monitoring Reports”. They also serve to guide the candidate countries in their preparations. A “Comprehensive Monitoring Report” serves as a basis to decide on any possible remedial measure to be taken by the Commission.