The political affiliate of US-backed Syrian militias accused Turkey's president on Monday of seeking to attack "under false pretenses" swathes of northern Syria which they control.
"We assert that the Syrian people will not hesitate to resist the Turkish aggression," said a statement from the political wing of the Syrian Democratic Forces (SDF).
With the Kurdish YPG militia at its forefront, the SDF alliance has taken vast territory from Islamic State with US backing. Ankara said on Monday that Turkish forces would press their offensive against the YPG in the north.