Since the end of February, when Turkey lost 34 soldiers in the Idlib region, the Erdogan administration has complained about the EU's lack of support for its policy in Syria.
To press for this aid to become effective, Turkey announced that it would allow the departure of Syrian refugees from its territory, which caused a wave of thousands of migrants who remain crowded in Edirne, near the Greek border.
Over the last month, at least 10,000 refugees, mostly from Syria, have reached the borders with Greece and Bulgaria with the intention of entering the European Union.
Since the Greek border authorities have prevented the arrival of new migrants, many Syrian refugees are returning to Turkey where the majority had resided for years.
However, Ankara has not changed its stance and insists that the European Union should open its doors to Syrian refugees.