This is just another gigantic deception. Enemies of Assad who have their own motives did this. They conspired to enter a false-labelled  poison  gas bomb into the airplane. How foolish can anybody think Assad is to do this to himself and invite international outrage and possible invention while it has no military value and he was winning already? Too bad the mainstream media and Trump are falling for this. It reminds me of Saddam's non existing weapons of mass destruction.