Tensions have included:
- Turkey's suspected soft handling of ISIS. Shared Sunni religion would be part of this. About 80% of Turks would be Sunni Muslim. ISIS is all Sunni Muslim. Also corruption in Turkey is high and the allure of blackmarket ISIS oil is high.
- November 24, 2015 - Turkey shooting down a Russian fighter-bomber.
- December 4, 2015 - Russia displays a man portable anti-aircraft rocket launcher (MANPAD) on a Russian warship in the Bosphorus Strait basically in Istanbul (Turkey's largest city)
Turkey is in a good geographical position to blockade or divide Russia's Mediterranean and Black Sea Fleets:
8 x 533mm torpedo tubes,
IDAS small missile anti-aircraft capability
Harpoon anti-ship missile and land attack
Mark 48 torpedos
This shows the Australian Navy hierarchy that US weapons with an indigenous combat system, can be fitted to German submarines.
See Youtube of Turkish naval vessels. Specific details of Turkish Type 214 submarine at https://youtu.be/hviZXRvMXjw?t=3m12s
One reason Turkey may be hesitant or maybe appeasing ISIS is due to the dangerous neighbourhood Turkey lives in (map below):