On June 24th, Turkish officials made it clear that they believed their plane was shot down illegally, and in international airspace.
June 25th saw a reply from Syria regarding Turkish statements. The Assad regime also made it clear that whatever the intentions of the Western states, Syria would not consent to the intervention of any nation that it did not consider sympathetic and an ally to the current government.
Only a day later NATO met in response to Turkish calls for an emergency meeting under NATO's article 4. Though the move was a clear message to Syria that Turkey would not fight alone should they be dragged into conflict, the participants did not call for direct action. Most importantly, they did not meet under article 5, which is the section covering the mutual protection of NATO members.
Today, however, saw an escalation in the tensions, as Ankara began to move troops and equipment to the Syrian border, including anti-aircraft missiles and military convoy trucks. This, in advance of a meeting to come on Saturday aimed at bringing the two sides to the negotiating table. Interestingly, both Iran and Saudi Arabia have been excluded as being to overtly in the corner of the Assad regime and the opposition respectively.
Additionally, Susan Rice, US Ambassador to the UN, has 'hinted' at the possibility of military conflict in the region according to the Wall Street Journal.
So the question becomes: "Is this just posturing, or are we witnessing the early days of the 'next war' in the Middle East?" If Turkey continues to spar with Syria can we expect Iran to respond? Would that provoke Saudi involvement? Will NATO take action to defend one of its members? Would Russia come to the aid of its long time ally in the region? All of these questions will be playing out in the next few days and weeks.
Meanwhile, on the ground in Syria we are seeing massacre after massacre. Civilians in the region are being slaughtered daily whether by government shelling or 'professional criminals' as the Syrian government calls them. Whether or not other states get involved, there is no question that it is the citizens of Syria who will suffer the most as this conflict plays out.