In this context, a German study confirmed that the number of Syrian refugees in Turkey may have been much lower than officially announced.
The Turkish government and UNHCR are talking about an estimated 3.6 million Syrian refugees in Turkey.
But on Monday, the German institute Dezim said on its website that it was "realistic" to consider the number of refugees to be around 2.7 million Syrians.
Deutsche Institute is part of the German Center for Integration and Migration Research in Berlin, which is supported by the Ministry of Family in Germany.
The German report concluded that the method of reporting data on IDPs had significant weaknesses "where, for example, there was no consistent system for regulating the way refugees were registered and re-registered elsewhere," which also meant that the names of those They returned to Syria or made their way outside Turkey.
The report notes that since the beginning of the Syrian crisis, at least 984,500 Syrians have left Turkey to return to Syria or to the EU or other countries.
Turkish President Recep Tayyip Erdogan has threatened Europe to open its borders to Europe if Europe does not provide more support to help his country shelter refugees.
Erdogan recently called for more money, as well as helping his country settle Syrian refugees in northern and eastern Syria, where he wants to settle up to three million Syrian refugees there, in order to target the demographic nature there.
Turkey entered into a refugee agreement with the EU in March 2016. The terms of the agreement include provision for billions of aid to Turkey, and allowing the EU to repatriate migrants arriving illegally on a Greek island.
Erdogan also used to play on the Syrian refugees' card and threaten to open their borders to Europe and drown them as they did in 2015, in pressuring the EU and its countries for more material and political gains.