Countries wishing to join the European Union (EU) must meet a set of legal, economic and political requirements. The progress that a candidate country makes to implement EU law and fulfil these requirements is monitored during the ‘accession negotiation’ process. The European Parliament’s approval is needed before a country can join the EU.
Application and accession requirementsAny European country can apply for EU membership if it respects and undertakes to promote the values common to all EU countries, as defined in Article 2 of the Treaty on European Union (TEU).
Candidate countries must meet specific political and economic criteria, known as the Copenhagen criteria. These include:
Application stage: A country that wishes to join the EU sends its application to the Council of the European Union, which asks the European Commission to submit an opinion.
Candidate status: If the Commission’s opinion is favourable, the Council may decide to grant the country candidate status. The Council must agree this unanimously.
Negotiations: The Commission carries out a detailed examination of 35 different policy fields (negotiating chapters), together with the candidate country, and either recommends opening negotiations immediately or asks for certain conditions to be met first. The Council then decides (by unanimity) to open negotiations, which take place between the governments of EU countries and the candidate country. Candidate countries may need to undergo a rigorous reform process, with a focus on the functioning of democratic institutions, judicial independence, media pluralism and the fight against corruption and organised crime.
Accession treaty: Once negotiations have been closed, an accession treaty containing the conditions and deadlines of membership is formally drawn up. The treaty is subsequently submitted to the Commission, the Parliament and the Council for approval. Each EU country and the candidate country must ratify (sign) the accession treaty according to their own procedures.
European Parliament’s roleParliament monitors the accession process throughout the negotiations with candidate countries. Specifically, the Committee on Foreign Affairs is responsible for coordinating the work on enlargement. The committee regularly exchanges views with the Commissioner responsible for enlargement negotiations, government representatives, experts and civil society actors.
Parliament gives its opinion on the annual Commission reports on individual candidate countries. It adopts resolutions on the accession process and comments on the progress of countries’ reforms.
Parliament also maintains bilateral relations with the parliaments of candidate and potential candidate countries through joint parliamentary committees and inter‑parliamentary meetings which take place once or twice per year.
Parliament’s budgetary powers give it direct influence over the financial aspects of accession, such as the EU funds allocated to support reforms in candidate countries (Instrument for Pre-accession Assistance).
Finally, Parliament must give its consent, by an absolute majority vote of more than half of all Members, before a country can join the EU (Article 49 TEU).
EU enlargement developmentsAs of early 2026, there are nine candidate countries: Albania, Bosnia and Herzegovina, Georgia, Moldova, Montenegro, North Macedonia, Serbia, Turkey and Ukraine.
Albania and Montenegro have made significant progress on the EU accession path by closing certain negotiating chapters and promoting an anti‑corruption and reform agenda.
In the case of North Macedonia, the opening of the first negotiating chapter depends on constitutional reform, progress on the anti‑corruption agenda and improved relations with neighbouring Bulgaria and Greece.
Ukraine and Moldova were granted candidate status in the aftermath of the Russian invasion of Ukraine. Ukraine and Moldova successfully completed the examination of their alignment with EU law in 2025. Once all EU countries agree, the negotiating chapters can be opened.
As regards Serbia, political turmoil and reform stagnation have slowed down the negotiations on matters that remained unresolved.
Accession negotiations with Turkey have been on hold since 2018, as the Turkish government has failed to address backsliding on democracy and the rule of law. In May 2025, Parliament said that Turkey’s accession process could not be re-started under the current circumstances as the accession process requires the fundamental values of the Union to be fully respected.
Political instability and institutional challenges inBosnia and Herzegovina have halted the opening of formal negotiations.
In 2024, the EU found that Georgia was backsliding on the rule of law and fundamental rights and therefore conditions to open negotiations had not been met.
Kosovo applied to join the EU in December 2022 but has not been granted candidate status. In May 2025, Parliament called on the five EU countries [CJ1] (Greece, Spain, Cyprus, Romania and Slovakia) that have not yet recognised Kosovo to do so, so that Kosovo can progress its accession process.
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