Turkey has been a formal candidate for European Union membership since 1999. The accession negotiations opened in 2005. In 2026, those negotiations are, for all practical purposes, over — not formally ended, but suspended in a state of managed irrelevance that neither side has the political interest to resolve.

Turkey is not in the EU. It is not heading toward the EU on any realistic current trajectory. And yet it remains one of the most consequential relationships in European foreign policy — a NATO ally of 85 million people, a country that controls the Bosphorus, that borders Syria, Iraq, Iran, and the Black Sea states, and that has positioned itself as an indispensable partner on migration, energy transit, and regional security.

Understanding Turkey's relationship with Europe means understanding how integration can fail — not through rupture but through gradual divergence, accumulated grievances, and the discovery that a framework designed for one kind of political relationship cannot easily accommodate a country that has chosen a different direction.

Turkey's relationship with European institutions goes back further than most people realise. It signed an association agreement with the European Economic Community in 1963 — the Ankara Agreement — that explicitly envisaged eventual membership. It applied for full membership in 1987. It was granted candidate status at the Helsinki summit in 1999, alongside several Central and Eastern European countries that would join the EU five years later.

The accession negotiations that opened in 2005 were the most genuinely optimistic moment in the relationship. Turkey under the AKP government of Recep Tayyip Erdoğan had undertaken significant democratic and economic reforms in its first years of power — reducing military influence in civilian politics, strengthening judicial independence, improving human rights standards, and delivering strong economic growth. European officials who had spent years arguing that Turkey was too large, too poor, and too culturally different to join were temporarily on the defensive.

The optimism did not last. The pace of reform slowed after the early accession momentum. Cyprus — an EU member since 2004 — blocked several negotiating chapters in retaliation for Turkey's refusal to open its ports and airports to Cypriot vessels and aircraft. France and Austria declared themselves opposed to full Turkish membership regardless of reform progress. And the internal Turkish political trajectory began to move in a direction that created mounting friction with EU standards.

Turkey and the EU: Key Facts

Association agreement: 1963 (Ankara Agreement)
Formal membership application: 1987
Candidate status granted: 1999 (Helsinki summit)
Accession negotiations opened: 2005
Chapters opened: 16 of 35; only 1 provisionally closed
Population: approximately 85 million
GDP: approximately $1.1 trillion (nominal)
NATO member: since 1952

The 2016 coup attempt against the Erdoğan government was a turning point in the EU-Turkey relationship.

The coup failed. The government's response was sweeping: mass arrests of military officers, judges, academics, journalists, and civil servants; a purge of institutions that removed tens of thousands of people from public positions; a constitutional referendum in 2017 that transformed Turkey from a parliamentary into a presidential system, concentrating executive authority in the presidency.

European institutions condemned the scope and speed of the post-coup crackdown. The European Parliament voted in 2016 to call for a formal suspension of accession negotiations, though the legal mechanism for such a suspension was never triggered. The relationship entered a period of sustained deterioration marked by rhetorical escalation on both sides — Erdoğan periodically accused European governments of supporting terrorism or harboring coup plotters, while European officials issued condemnation reports that Turkey ignored.

By 2018, the European Commission's annual progress reports on Turkey had largely abandoned the pretence that accession was an active process. The language shifted from assessing reform progress to documenting democratic regression.

As the accession framework hollowed out, it was replaced by a transactional relationship centred on three issues: migration, defence, and energy.

On migration: the 2016 EU-Turkey Statement — often called the migration deal — was the most consequential agreement in the relationship's recent history. Turkey agreed to accept returned migrants who had crossed to Greek islands irregularly, in exchange for EU financial support, visa liberalisation commitments, and reinvigoration of the accession process. The deal reduced irregular crossings from Turkey to Greece dramatically in 2016, though its legal and humanitarian dimensions remained contested.

Turkey has subsequently used the migration relationship as leverage — periodically threatening to "open the gates" when relations with Brussels deteriorate, and expecting financial and political concessions in return for continued cooperation.

On defence: Turkey is NATO's second-largest military by personnel and controls the Bosphorus — the strategic waterway connecting the Black Sea to the Mediterranean. Its cooperation or non-cooperation has direct consequences for NATO operations, Black Sea security, and the management of Russia's naval capacity. During the Ukraine war, Turkey used its position to mediate between Russia and Ukraine, facilitate a grain export agreement, and sell Bayraktar drones to Ukraine — all while refusing to join EU sanctions against Moscow.

This multi-directional positioning — maintaining NATO membership while refusing to align with Western sanctions, supporting Ukraine while trading with Russia — is a precise expression of Turkey's strategic doctrine: autonomous hedging, indispensable to multiple parties, committed to none.

European discussions of Turkey tend to oscillate between two equally partial framings.

The first frames Turkey as a country that was always culturally incompatible with Europe — too Islamic, too authoritarian, too large, too different. This framing was common in the early accession debates and has resurfaced in various forms since. It underestimates the degree to which Turkish society is genuinely pluralistic, the extent to which Turkish secular traditions have deep roots, and the role that European ambivalence played in empowering the political forces that moved Turkey away from democratic consolidation.

The second framing, common among accession advocates, holds that Turkey's current political trajectory is a temporary deviation that will be corrected — that the country will eventually return to the European path if the EU maintains engagement. This framing underestimates how deep the political and institutional changes of the past decade have gone, and how much Erdoğan's governance model has reshaped Turkish state institutions in ways that will persist beyond his tenure.

The honest assessment is somewhere in between: Turkey is a genuinely complex country that made genuine progress toward European standards in the early 2000s, experienced a democratic reversal in the 2010s, and is now in a period of political evolution whose outcome cannot be predicted from outside. The EU's framework for managing that complexity — formal candidacy without real accession prospects — is not adequate to the relationship that actually exists.

Turkey is the country that best illustrates what European integration cannot do: it can pull willing reformers toward its standards, but it cannot transform a country that has decided, for its own reasons, to go in a different direction.

Looking Ahead to Friday

Turkey chose strategic autonomy over European integration. Friday's EuroTasteDaily Review examines what that choice looks like in practice — and what Europe can learn from the longest accession process that never concluded.