In a letter to The New York Times titled 'A Looming Disaster in Syria', Mevlut Cavusoglu warned that the YPG terrorist group has struck an alliance with Bashar al-Assad and is sending troops to help him recapture Idlib from the rebels.

“The alliance has grown deeper since senior leaders of the Syrian Democratic Forces, spearheaded by the YPG, held formal talks with the Syrian government to take part in the new Syria,” he said.

"Having YPG forces operating from Syria, just miles from the border of Turkey, is untenable. It’s time for Washington to assess who its real allies in the region are."

The Syrian Government recently announced plans to launch a major military attack in Idlib, which has long been controlled by various armed opposition groups.

As a result, Turkey has been reinforcing its military presence on the border with Syria.

Cavusoglu also emphasized in the letter that the YPG is the Syrian affiliate of the PKK, which has led a violent terror campaign in Turkey for more than 30 years and that Turkey, the U.S. and the EU have listed the PKK as a terrorist organization.

In its more than 30-year terror campaign against Turkey, the PKK has been responsible for the deaths of some 40,000 people.