From 2012: Syria shoots down Turkish plane
"Turkey's prime minister, Recep Tayyip Erdogan, has threatened Syria with retaliation for shooting down a military jet, and warned that Turkish armed forces will respond to any Syrian encroachment on the border.
Nato secretary general Anders Fogh Rasmussen said the alliance stands by Turkey but is not considering a military response."
http://www.theguardian.com/world/middle-east-live/2012/jun/26/syria-crisis-nato-meeting-live
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Graphic showing where the Turkish F-4 Phantom went down