A Treaty of Accession to the European Union is an intergovernmental treaty of the European Union that specifies the terms under which an applicant state becomes a member of the European Union. It represents the fundamental act to enable a state to become a member of the EU, thereby binding it to the fundamental principles of the union. In addition to the Treaty of Accession, a Final Act of Accession is signed. The Final Act registers the results of the accession negotiations, including declarations made by the parties. It also lays down arrangements for the period between signing and entry into force of the treaty.
The negotiation process to draft a Treaty of Accession between a "candidate country" and the European Union involves the agreement to the chapters of the acquis—35 as of May 2024. All reforms necessitate structural changes to the national legislation in order to accommodate for the institutional bodies of the EU and delegated power associated with it.[1] Upon the agreement of EU governments, including the unanimous decision by the European Council, negotiations are screened by the European Commission. The candidate country must submit a common position with the EU on its action plans and interim benchmarks; no set time frame is guaranteed or outlined, and negotiations are heavily contingent on the degree of reform and alignment that a candidate country had from its status quo ante.[2]
Once negotiations conclude, the EU and candidate country work towards developing the candidate’s Treaty of Accession. However, the treaty only becomes finalized and binding once it is approved by all three EU decision-making bodies (European Commission, European Council, European Parliament), signed by the candidate country and existing member states, and ratified by the candidate country and existing member states at the national scale.[2] The treaty then enters into force the day following ratification, which is agreed upon beforehand.[3] It outlines the candidate country’s obligations and rights, including the implementation and adoption of the acquis.[4] Accordingly, each accession treaty puts forth broad principles and rules, resulting in a change to primary law. Following the signing of the Treaty of Accession, “acceding countries” are promised full membership status upon the mutually agreed terms and benefit from certain procedures. For example, the acceding country may sit in on legislative proceedings in the European Parliament through a consultation procedure and comment on draft proposals. In other EU bodies, they may hold an active observer status, meaning they may spectate all proceedings but have no voting powers until their full membership status.[5]
The Western Balkan countries seeking accession have a special process. Prior to the drafting of a Treaty of Accession and the status of a “candidate country” before that, Western Balkan nations require an extra step.[6] A country from the Western Balkans can be offered a “potential candidate country” contingent on reforms related to economic stability and regional cooperation before it may be considered for candidacy at large. In the meantime, such countries maintain various association or stabilization agreements meant to construct dialogue on mutual rights and obligations that would precede accession.
Ukraine’s unique potential accession status to the EU is a variation of the general rule.
^"Chapters of the acquis / negotiating chapters - European Commission". neighbourhood-enlargement.ec.europa.eu. Retrieved 2024-05-13.
^ ab"Steps towards joining - European Commission". neighbourhood-enlargement.ec.europa.eu. Retrieved 2024-05-13.
^"Treaty of accession - European Commission". neighbourhood-enlargement.ec.europa.eu. Retrieved 2024-05-13.
^"Accession to the EU - European Commission". neighbourhood-enlargement.ec.europa.eu. Retrieved 2024-05-13.
^"Acceding countries - European Commission". neighbourhood-enlargement.ec.europa.eu. Retrieved 2024-05-13.
^"Steps towards joining - European Commission". neighbourhood-enlargement.ec.europa.eu. Retrieved 2024-05-13.
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