I heard on the radio that Turkey sees itsself as the protecting power for the Turkmen minority living in Syria.
There have been attacks lately by Assad troops with Russian air support against the Turkmen, who oppose the Assad regime.
A Turkmen leader was quoted saying they could fight Assad's troops successfully like they did in the past but that they can do nothing against the Russian air strikes.
So it seems that Turkey shot down the aircraft to show Russia that it does not tolerate actions against Turkmen in Syria.
Btw, no one seems to care about the Kurdish people in this conflict who live as minorities in Turkey, Syria, Iran and Irak. They are stuck between hammer and amboss.
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