Bashar al-Assad's forces are helping Daesh and PKK/PYD in opposing the Free Syrian Army (FSA), a commander said Tuesday.

Abu Ramadan said Daesh and the PKK/PYD were acting together along the Marea-Jarabulus line in northern Aleppo province.

"Daesh came into action four years ago when Assad could not cope with the opposition," he told Anadolu Agency. "Now, the regime not only helps Daesh but also PKK/PYD in the region."

He added: "The regime and PKK/PYD play every single play to prevent the FSA's progress against Daesh in the region."

The PKK and its Syrian offshoot the PYD are both listed as terrorist groups by Turkey although the U.S. and EU only view the PKK as a terrorist organization.

Operation Euphrates Shield, which began on Aug. 24 backed by the Turkish Armed Forces, is aimed to bolster border security, support coalition forces, and eliminate the threat posed by terror organizations, especially Daesh.