* Btw the vote of the UN/Security Council is the legal way to deal with this, and one could say that this vote actually saves Assad to some degree.
But ill bet my black socks that IF Syrian forces would take the fight to far over the border (Either willing or pushed by stupidity or even due a rebel setup)
That Turkey will listen to the UN council to deal with this the legal way, knowing that the UN will support them.
On the other hand Turkey has the ability and internal laws in place to strike on Syria in full force if it feels that it must defend national interest and to protect its civilians.
So my point here Turkey is deffo going to play ball in cooperation with the UN/NATO.
But if casualties keep mounting on their side of the border then they will act with or without UN/NATO support.
Turkey authorized cross-border incursions into Syria when "necessary"
And that gives them the legal ground to basically crack down on Syrian/Rebel forces on Syrian soil and this could be a very dangerous situation for Assad, given the fact that if his forces keep killing Turkey civilians (Willingly or unwillingly) Turkey can and will respond in ways that can bring down Assad or at least seriously cripple him.
The vote of the UN Security Council would only needed to re-task the UN observers on the Israel-Lebanon border. The UN Security Council would have little relevance to Turkey’s response to a Syrian attack on them, that would come under self defense, which is allowed under the UN charter.
Turkey has the capabilities to swing the battle against Assad, but potentially at the price of a considerable number loss of aircraft (as demonstrated by the F-4 shot down). The other NATO powers can supply the additional capacity for SEAD missions to suppress the air defenses and minimize these losses, but is likely to be perceived as a Libya type intervention by the western powers, which the Arab states wish to avoid.
A ground invasion by Turkey poses a major problem because all the nations in the area remember that Turkey ruled them as part of the Ottoman Empire less than a century ago, and have no desire to see it revived, and which some vocal Turkish politicians advocate. A general invasion of Syria by Turkey has the potential to unite the various armed groups against the Turks, and possibly even ally them to Assad. A more limited campaign to establish a no-fly zone in northern Syria would not have that problem.
There is also the covert war between the elected government and the generals that has left Turkey with a politically chosen military leadership and reduced moral. If Turkey intervenes without western support and suffers heavy losses, the backlash could result in a military coup and suppression of the religious parties, again.
Another major factor to consider about Turkish decision making is that Prime Minister Erdogan over the last few years put a lot of diplomatic effort into strengthening ties with the Muslim world, including demonizing the western powers (including NATO allies) and Israel, and making major friendship deals with Syria and Iran, in an effort curry favor with the religious parties at home. Now he finds himself in a situation where Syria and Iran are the bad guys, but effective intervention is only possible with the assistance of the rest of NATO, which will not sit well with his religious support in upcoming elections. Like any politician in this position he will be tempted to do nothing in hopes of being saved by changing circumstances.