This was a stupid move on both Russia and Turky's parts but this was not a passenger jet it was a military aircraft and Russia has been playing with fire over and over doing this to many countries airspace's and has been warned over and over to knock it off. Someone was going to do this eventually. The really stupid thing was downing of the helicopter. I really hope that was the rebels and not Turkey.
The Turks knew that the fleeting presence of the plane posed no threat whatever to Turkey. The Turks are collaborating with terrorists, just as they impeded our effort during the Iraq war. I did read that the helicopter was shot down by “rebels” using a TOW missile WE provided. It wouldn’t surprise me if that were true because it appears that the Obama/Clinton Dept of State was illegally running weapons to Syrians.