there was no need to take the shot.
The Turks obviously saw it otherwise. It certainly raises the stakes and will give Putin pause for thought before deciding if he wishes to escalate.
Putin may have originally have seen this as an easy flag waving exercise to help any ally in Assad whilst rubbing Obama and Europe's noses at their irrelevance. Suddenly he is on the point of being sucked into a major confrontation he can't afford economically or politically.
He also has little chance of persuading Saudi or any of the other Gulf OPEC states to help get the price of oil back up. Nice one Vlad........