This is not physics, it's basic fact checking. The land is 2km wide, of course the Turkish fighter didn't have time to notice the intrusion, establish radio contact, perform a sideway warning show then down the plane.<p>However, they may have warned 10 different Russian planes in5 minutes. The intrusion may have been a repeated act. The Russian may have been provoking the reaction. It seems like we won't know. Would the solution be to change the border to a straight line and connex area, instead of a Turkish valley inside a Syrian mountain?<p>I liked Obama's reaction when he said Russia was too busy killing the rebels instead of Daesh.