. . . actually requires cooperation. Otherwise this happens:
The Turkish military says it shot down an unidentified warplane Tuesday near the Turkish-Syrian border, contending it repeatedly violated Turkish airspace and ignored repeated warnings. Turkey's semi-official Anadolu news agency cites Turkish Presidential sources in reporting that a Russian SU-24 was "hit within the framework of engagement rules" in Syria's Bayirbucak area near the Turkish border.
One wonders how much of this incident may be due to the countries not cooperating, and how much to the ineptness of the Russian Air Force. They have not been covering themselves with glory over Syria, despite what their press says.
This seems like the Turks just said, enough's enough, jack-holes. . .