Turkish President Recep Tayyip Erdogan threatened to allow Syrian refugees to leave Turkey for Europe unless a 'safe zone' inside Syria is established in a speech to AKP members in Ankara on Thursday.
If the situation were to deteriorate in the militant enclave of Idlib, Erdogan believed "there might be a new refugee crisis with millions at our door."
Ankara has been pushing for a safe zone along the Turkish-Syrian border, as first proposed by US President Donald Trump. He said the US had to give "ground" or troops would unilaterally move into the area.
Such an action would threat US allies the Kurdish People's Protection Units (YPG), which Ankara regards as a terrorist organisation.
Turkey is currently hosting some 3.6 million Syrian refugees, under a 2016 agreement with the European Union.