In 1959, Turkey was one of the first countries to seek close cooperation with the young European Economic Community (EEC). This cooperation was implemented within the framework of an « association agreement », the so-called Ankara Agreement, signed on 12 September 1963. An important element of this plan was the creation of a « customs union » to allow Turkey to trade goods and agricultural products without restrictions with EC countries. The main objective of the Ankara Agreement was to « achieve a continuous improvement of living conditions in Turkey and the European Economic Community by accelerating economic progress and harmoniously expanding trade, as well as on the inequality between the Turkish economy and . the Community`. It will not be easy to find a new consensus. Ankara wants to impose progress in its demands, including support for its operation in Idlib and much more resources for Syrians in Turkey, but EU leaders do not want to appear hostage to President Erdoğan. Brussels` desire to remain firm in its other differences with Ankara tarnishes the prospects for a quick solution to the current migration dispute. The 2016 deal centered on the so-called « One-for-One » program, in which Turkey sent a Syrian refugee to the bloc it brought back for each of the Greek islands. On 20 March 2016, an EU-Turkey agreement to address the migrant crisis formally entered into force. The agreement is expected to limit the influx of irregular migrants entering the EU via Turkey. One of the central aspects of the agreement is the return of irregular migrants to Ankara, the Turkish capital, who entered the EU via Turkey without having already undergoen a formal asylum application procedure. Those who had circumvented the asylum procedure in Turkey would be repatriated and placed at the end of the application line.
Both sides believe that the 1996 EU-Turkey Customs Union needs to be improved to take account of developments since its conclusion. But from 2017, technical negotiations on the revaluation of the customs union agreement will be made difficult to the advantage of both parties by the persistence of tensions between Ankara and Brussels.  On 26 June 2018, the General Affairs Council of the European Union declared on 26 June 2018. The EU`s controversial refugee deal with Turkey has been ongoing for two years. But some problems remain, and the question of financing, in particular, is not yet fully resolved. The agreement also included promises to ease visa restrictions for Turkish citizens, revive negotiations for Ankara`s accession to the EU and upgrade the customs union between the two sides. The Turkish Government argued that Brussels was not on its side with the agreement on these issues, although it had fully complied with it. From now on, Turkey must ask itself a question about the deal, Nas says: « What will be the future of the Syrians? » Turkey has repeatedly threatened to denounce the agreement, firstly because the EU has not paid the agreed amount and, secondly, because the visa waiver provided for in the agreement for Turkish citizens has not been implemented. .