A Relationship Unlike Any Other

Turkey's relationship with the European Union is one of the most complex and protracted in the history of European integration. Turkey formally applied for membership in 1987, was recognised as a candidate country in 1999, and began accession negotiations in 2005. Today — decades later — those negotiations are effectively frozen, yet the relationship remains deeply consequential for both sides. Here's what you need to know.

1. Why Did Turkey Seek EU Membership?

Turkey's EU ambition was rooted in the Kemalist vision of modernisation and westward orientation. The EU represented a model of rule of law, democratic governance, and economic prosperity that successive Turkish governments saw as both a goal and a catalyst for domestic reform. Practically, EU membership would mean access to the single market, free movement of citizens, and a significant boost to foreign investment.

The prospect of membership also served as a powerful driver of reform during the early 2000s, when Turkey undertook sweeping changes to its constitution, civil law, and human rights framework to align with EU standards — the so-called Copenhagen Criteria.

2. Why Have Negotiations Stalled?

The accession process has been effectively frozen since around 2016, for several interlocking reasons:

  • Rule of law concerns: The European Parliament and EU institutions have cited concerns about judicial independence, press freedom, and the treatment of opposition figures in Turkey.
  • The Cyprus dispute: Turkey does not recognise the Republic of Cyprus — an EU member state — and its refusal to open ports and airports to Cypriot traffic has blocked several negotiating chapters.
  • Political will on both sides: Several major EU member states — notably France and Austria — have at times openly questioned whether Turkey could or should ever join the EU, citing cultural and geopolitical arguments.
  • Post-2016 coup attempt: The broad crackdowns following the failed 2016 coup attempt deepened European concern about Turkey's democratic trajectory.

3. What Is the Current Status?

Formally, Turkey remains a candidate country and accession talks have not been officially terminated by either side. In practice, no new chapters of the accession framework have been opened in years. The European Parliament has passed resolutions calling for the formal suspension of talks, but the EU Council — representing member state governments — has not followed suit.

A key practical link that does remain active is the EU–Turkey Customs Union, in place since 1995, which covers industrial goods and processed agricultural products. There have been periodic discussions about modernising this agreement, though progress has been slow.

4. Why Does the Relationship Still Matter?

Despite the frozen accession process, Turkey and the EU remain deeply interdependent:

  • Migration: The 2016 EU–Turkey Statement was a landmark deal to manage irregular migration flows from Turkey into Greece and the rest of Europe. Turkey hosts the world's largest refugee population — millions of Syrians — and this remains a significant lever in the relationship.
  • Trade: The EU is Turkey's largest trading partner, and Turkey is among the EU's top trading partners. Bilateral trade runs into hundreds of billions of euros annually.
  • Security: As a NATO member controlling the Bosphorus, Turkey's strategic cooperation with Europe is non-negotiable, regardless of political tensions.

5. What Does the Future Hold?

Most analysts consider full EU membership for Turkey to be a distant and uncertain prospect. Yet a complete rupture also seems unlikely, given the mutual dependencies outlined above. The most probable scenario is continued "privileged partnership" in practice — close trade and security ties without the formal framework of membership — even if neither side fully accepts that framing publicly.

For Turkey, the EU relationship will continue to matter as a benchmark for governance standards, a major economic partner, and a diplomatic card to play. For the EU, Turkey is too large, too strategically significant, and too closely interwoven to be ignored — however complicated the politics remain.