Turkey will join Russian operations against ISIS in Syria
Turkish Foreign Minister Mevlut Cavusoglu said that Turkey, along with Russia will fight against the "common enemy - ISIS" (an organization banned in Russia). He added that "we will discuss all the details. We have always called for Russia to carry out anti-terrorism operations together."
Background on this from Katehon:
Yet another field where the two countries’ cooperation is crucial is the fight against the terrorist groups ISIS and Al-Nusra (now “Jabhat Fatah al-Sham”) which Ankara also considers to be a terrorist organization.
Another point of contact areradical Islamists, who threaten Turkey also, especially after it initiated the revision of Ahmet Davutoglu's Neo-Ottoman policy. Turkey formally announced al-Nusra and the ISIS to be terrorist organizations. Therefore, it can formally join the Russian operations in Syria against these structures. An open Turkish operation against Nusra Front under the banner of the fight against terrorism would help Turkey itself to distinguish between "moderate" and "immoderate" Islamists targeting those, who are loosely controlled or are dangerous for the country in changing circumstances. Turkey is also interested in having part of the most radical Islamists, who arrived in Syria from Turkey, and are able to be a destabilizing factor, permanently eliminated. In that, Turkey's interests fully coincide with Russia. The exchange of intelligence and military information could help eliminate a number of too radical or uncontrolled leaders and groups at the hands of Russia and Syria, in cases where Ankara could not do it by itself.