Collinsworth: This kind of back and forth, we've seen it. Every time a stray shell lands across its border, Turkey does fire into Syrian territory. So this is not completely unusual, but at times like this there is increased tension.
Özel: At the time the jet was shot down, the Syrians were likely bombing the Islamic State of Iraq and the Levant, and I don't know whether [Turkey's actions] have really stopped that operation. Turkey must have let NATO know what it did because it's a NATO member and [an action like this] does concern its allies. I don't think it will go any further, but the thing to watch will be what Turkey will do.
[Earlier this year] ISIS gave an ultimatum to Turkey and said, We'll attack your troops at Suleiman Shah. [Turkey still has a small number of troops stationed at the tomb of Suleiman Shah, 20 miles from the Turkish border in Syria, and ISIS has recently captured towns near the tomb.] On one hand, the tomb is Turkish territory, and to reach it [and evacuate those troops], Turkish jets will have to fly inside Syria, so they'd have to get permission from the government in Damascus. But if the threat does materialize, Turkey will have to figure out how to do something about that.