Turkey will mount a military operation in northeast Syria, it said Saturday, after accusing Washington of not doing enough to expel Syrian Kurdish fighters from its border.

The air and ground operation east of the Euphrates River in Syria could start at any time, President Recep Tayyip Erdogan said.

The U.S.-backed force which controls the region, the Syrian Democratic Forces (SDF) led by the Kurdish YPG militia, said it wants stability but vowed to respond to any attack.