It also could be a case where the Russians baited the Turks ... and the Turks called their bluff.
Watch the video by the U.S. Air Force General linked to above. Or here it is again: http://video.foxnews.com/v/4630118119001/radar-track-shows-russia-jets-path-over-turkish-territory/?intcmp=hpbt2#sp=show-clips