The European Union (EU) has expanded a number of times throughout its history by way of the accession of new member states to the Union. To join the EU, a state needs to fulfil economic and political conditions called the Copenhagen criteria, which require a stable democratic government that respects the rule of law, and its corresponding freedoms and institutions. According to the Maastricht Treaty, each current member state and the European Parliament must agree to any enlargement. The process of enlargement is sometimes referred to as European integration. This term is also used to refer to the intensification of co-operation between EU member states as national governments allow for the gradual harmonisation of national laws.
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.
In talks with countries that have expressed a wish to join the European Union, the EU typically concludes Association Agreements in exchange for commitments to political, economic, trade, or human rights reform in that country. In exchange, the country may be offered tariff-free access to some or all EU markets, and financial or technical assistance.
The CARDS programme, of Community Assistance for Reconstruction, Development and Stabilisation, is the EU's main instrument of financial assistance to the Western Balkans, covering specifically the countries of Croatia, Bosnia and Herzegovina, Serbia, Montenegro, North Macedonia, Kosovo and Albania. It was created in 2000 by Council Regulation 2666/2000. However it was only in 2001 that the programme became operative under its own regulations, as in the first period it supported projects previously funded by the PHARE and OBNOVA programmes. The programme is the main financial instrument of EU's Stabilisation and Association process (SAp). A total of €5.13 billion is secured for all CARDS actions during 2000-2006, as after that day it will be replaced by the Instrument for Pre-Accession Assistance (IPA), which will cover both candidate and potential candidate countries.
Albania is on the current agenda for future enlargement of the European Union (EU). It applied for EU membership on 28 April 2009, and has since June 2014 been an official candidate for accession. The Council of the European Union decided in March 2020 to open accession negotiations with Albania.
The accession of Bosnia and Herzegovina to the European Union (EU) is the stated aim of the present relations between the two entities. Bosnia and Herzegovina has been recognised by the European Union as a "candidate country" for accession since the decision of the European Council in 2022 and is on the current agenda for future enlargement of the EU. Bosnia and Herzegovina takes part in the Stabilisation and Association Process and trade relations are regulated by an Interim Agreement.
Accession of Montenegro to the European Union is on the agenda for future enlargement of the EU.
Serbia applied to join the European Union (EU) in 2009 and has been a candidate for membership since 2012, along with nine other states. Serbia is the largest country in Southeast Europe seeking entry into the EU.
Tonino Picula is a Croatian politician currently serving his fourth term as a Member of the European Parliament for Croatia, having successfully run in 2013, 2014, 2019 and 2024 European elections.
The Instrument for Pre-Accession Assistance, or simply IPA, is a funding mechanism of the European Union. As of 2007, it replaced previous programmes such as the PHARE, ISPA, SAPARD and CARDS. Unlike the previous assistance programs, IPA offers funds to both EU candidate countries and potential candidates.
The accession of Kosovo to the European Union (EU) is on the current agenda for future enlargement of the EU. Kosovo is currently recognized by the EU as a potential candidate for accession.
There are currently nine states recognized as candidates for membership of the European Union: Albania, Bosnia and Herzegovina, Georgia, Moldova, Montenegro, North Macedonia, Serbia, Turkey, and Ukraine. Kosovo formally submitted its application for membership in 2022 and is considered a potential candidate by the European Union. Due to multiple factors, talks with Turkey are at an effective standstill since December 2016.
The accession of North Macedonia to the European Union has been on the current agenda for future enlargement of the EU since 2005, when it became an official candidate for accession. The then Republic of Macedonia submitted its membership application in 2004, thirteen years after its independence from Yugoslavia. It is one of nine current EU candidate countries, together with Albania, Bosnia and Herzegovina, Georgia, Moldova, Montenegro, Serbia, Turkey and Ukraine.
On 28 February 2022, four days after it was invaded by Russia, Ukraine applied for membership of the European Union (EU). Ukrainian President Volodymyr Zelenskyy requested immediate admission under a "new special procedure", and the presidents of eight EU states called for an accelerated accession process. European Commission president Ursula von der Leyen stated that she supports Ukrainian accession, but that the process would take time. On 10 March 2022, the Council of the European Union asked the commission for its opinion on the application. On 8 April 2022, von der Leyen presented Zelenskyy with a legislative questionnaire, which Ukraine responded to on 9 May.
Cyprus–Serbia relations are considered as strong, due to common European policies and the sharing of Orthodoxy as a common religion. Cyprus has been a supporter of Serbia in its efforts to join the EU. Likewise, Serbia has been advocating a stable Cyprus after the Turkish invasion in 1974 and supporting a lasting solution to the Cyprus dispute. Cyprus has an embassy in Belgrade. Serbia has an embassy in Nicosia.
The Berlin Process is an intergovernmental cooperation initiative linked to the future enlargement of the European Union.
From the establishment of the European Economic Community in 1957 until the breakup of Yugoslavia in the early 1990s, thus during the Cold War period, the Socialist Federal Republic of Yugoslavia was the first socialist state to develop relations with the organisation. Notwithstanding occasional and informal proposals coming from both sides, Yugoslavia never became a full member state of the EEC.
The Western Balkans Quad is an initiative launched in March 2023 by four Western Balkan countries, Albania, Kosovo, Montenegro and North Macedonia, to support policy alignment with the European Union's Common Foreign and Security Policy.
The Strategy for the Western Balkans is a policy pursued by the EU with its partners and accession candidates in the western region of the Balkan Peninsula. Announced by European Commission President Jean-Claude Juncker in his 2017 State of the Union address, this policy brings together the objectives of the global strategy for CSDP and the enlargement policy specific to the states in this region.
The 2022 EU–Western Balkans summit was the fourth edition of the European Union–Western Balkans summit held on 6 December 2022 in Tirana, Albania. Hosted by the Albanian Prime Minister, Edi Rama, the summit brought together heads of state and government from the Western Balkan nations, including Bosnia and Herzegovina, Kosovo, Montenegro, North Macedonia, and Serbia, alongside other EU representatives. Amid the setting of the ongoing Russo-Ukrainian War, it underscored the union's commitment to strengthening its political, economic, and security cooperation with the region. Among the central themes of the discussions was the union's support for the region's integration, particularly through the alignment of the Western Balkans with EU standards. The Tirana Declaration, one of the summit's key results, reaffirmed the EU's dedication to the region's EU accession process, while highlighting the demand for political and institutional reforms and democratic principles.
