Free Syrian Army (FSA) troops have begun entering areas in the northwestern Syrian city of Afrin, which is under occupation by terrorists from Kurdistan Workers' Party (PKK)'s Syrian offshoot, the PYD.
Turkish military units are already deployed in Afrin, a district of Aleppo near the Turkish-Syria border, which is under siege by the PYD/PKK terrorist organization.
An Afrin operation would follow Turkey's successful seven-month Operation Euphrates Shield, which ended in March 2017.
The PKK is listed as a terrorist organization by Turkey, the European Union and the United States. The PKK has been conducting armed violence in the southeastern part of Turkey since 1984. More than 40,000 people, mostly civilians, have been killed in the three-decade long conflict.