this is based on a lie!
Yes, it's based on a lie, more than likely. But Trump has to respond if that's what the CIA is telling him happened. Political realities will cost Syria their airfield, but Tillerson has already said that the ousting of the Assad regime is not on the table any time soon until after ISIS is toppled, and even then, would be brought about by peaceful measures.
That means Assad will still be standing tomorrow morning, and the day after that, and the week after that, minus one airfield.
Russians would have had advanced warning too, and I wouldn't be surprised if they gave consent to begin with.