Turkey will be responsible for helping so-called Islamic State to re-establish a Caliphate in Syria, French president Emmanuel Macron has warned, as he called on the country to stop its military offensive against Kurdish forces the north of the country.

"Turkey is putting millions of people at humanitarian risk," Macron said at a news conference.

"In doing so, Turkey will be responsible in front of the international community for helping Daesh (so-called Islamic State) building a Caliphate."