1. Russia is not threatening to invade Turkey, yet. Of course that did not stop NATO in the Balkans from making war on Serbia.
2. Greece is also a NATO ally. So in a Greece-Turkey dispute, who does NATO back?
3. Syria is not invading Turkey.
There seems to be a single common thread in these disputes, they involve one nation whose best friend happens to be Barack Obama.
One final note, I know one NATO country that will not come to Turkey's aid in a war with any of these other countries.
How did NATO handle Turkey’s 1974 invasion of Cyprus?