Airspace.

This is coolbert:

Congestion in the skies over Syria and contiguous areas becoming acute. In the near future to become even more extreme.

Warplanes of a variety of nations now having a combat mission, manned combat aircraft and drones.

"Freedom of action" what is deemed without conflict the goal! Without consultation and prior agreement this becomes difficult.

First from DEBKAfile:

"Netanyahu, Putin to discuss continued Israeli air force freedom of action over Syria"

16 September.

"Prime Minister Binyamin Netanyahu will discuss with President Vladimir Putin in Moscow on Sept. 21 continued Israeli Air Force freedom of action against threats coming from Syria. This would necessitate coordination between the Russian and Israeli air commands to avoid accidental collisions between their warplanes. A deal on these lines, tacitly agreed between Washington and Moscow, enables US air strikes against ISIS."

Furthermore and more recently from core.com:

"Kerry: Russian fighter jets in Syria raise serious questions"

"LONDON (AP) The United States is disturbed by Russia's movement of tactical aircraft to Syria, U.S. Secretary of State John Kerry said Saturday, acknowledging that the jets could pose a threat to American and allied military forces."

ONLY AS IS REPORTED TODAY SECRETARY KERRY NOW SUGGESTING THE UNITED STATES NOW WILLING TO ALLOW A NEGOTIATED SETTLEMENT OF THE SYRIAN CIVIL WAR, EVEN INCLUDING A PROVISO THAT ALLOWS ASSAD TO REMAIN IN POWER!!

coolbert.