Note that the Russian plane was downed right on the proposed NO FLY ZONE:
This is no coincidence. Turkey Air Force is already escorting the incursion of thousands of jihadists trained and armed by the US through that area.
Make no mistake about it. This was no accident. Yesterday was just the beginning of the implementation of the No Fly Zone.
Turkmen + Al Nusra (Al Qaeda) which equates to the Free Syrian Army is planning to take over that region and they are already testing the Russians in the area.
I would not be surprised to hear that US will start flying their planes closer to the area, to "de-conflict" and "stabilize". that will be just a front to start taking over the airspace. I will not be surprised if we see a few dogfights between Russians and US/Turkish jets in the coming weeks or at least a barrage of Anti Aircraft Missiles from both sides. Russia might have the upper hand in this as they have installed s400 systems, the most advanced air defense in the world. But obviously US planes are superior.
If the West is successful with this, they will start filling that No Fly Zone with civilians and basically use them as human shields, while using that zone as a corridor to send in thousands of jihadists straight to the heart of Assad's territory.
Make no mistake about it, the battle for the No Fly Zone has started.