US forces began patrolling a part of the Turkish-Syrian border after the recent Turkish air strikes against allied fighters closely with the United States. Units of the Kurdish People’s Protection and Peshmerga have announced that at least 25 of their fighters were killed in the raids, last Tuesday, while Ankara denies deliberately targeting them.

The People's Protection Units of the Syrian Democratic Forces, an armed coalition backed by the United States, are fighting against ISIS extremist group but the Turkish government considers it a terrorist group.

Turkish military jets have carried out air strikes against Kurdistan Workers' Party (PKK) fighters in northern Iraq and northeast Syria, killing at least 70 people, according to a Turkish military statement.

A statement released by Turkey's air force said that it carried out the air strikes against PKK targets located in the Sinjar Mountains region in northern Iraq and in Karachok Mountains in northeastern Syria on Tuesday.

The targets were hit to prevent the PKK from sending "terrorists, arms, ammunition and explosives to Turkey," the statement said, adding that the operation was conducted "within the scope of the international law".

US forces have been accompanied by Kurdish units of People’s Protection militias patrolling the Syrian-Turkish border since Friday. "We are asking each of our partners to focus their efforts on the organization of ISIS, which poses the greatest threat to peace and stability in the region, and even the entire world.