Erdogan and his Foreign Minister Ahmet Davutoglu are making all kinds of foreboding pronouncements after twin car-bombings in the Turkish town of Reyhanli, widely regarded as a major conduit in cross-border trafficking of weapons and fighters by the Turk-sponsored rebels.
The Turkish government long had amicable relations with the Assad regime, but were prevailed upon by their NATO masters to facilitate the ill-fated "uprising" next door. Originally marketed as the next manifestation of Arab Spring, most Western pundits spent the first year and a half predicting that the Assad regime was weeks away from collapse.
Now that the "Syrian uprising" is well into its third year, Erdogan and Davutoglu have good reason to be furious with the NATO geniuses who pushed them into this adventure. As for what they can do about it at this point, the answer is "not much."
It's a little late to start observing international norms against conniving to burn down one's neighbour's house. Now that they've got a roaring blaze going across the fence, the Turks can expect many more episodes of blow-back erupting on their side of the line.