Russian raids repeatedly hit Syrian Turkmen areas, Moscow's data shows

By Jack Stubbs and Humeyra Pamuk MOSCOW/ISTANBUL (Reuters) - Russian air strikes in northwest Syria have heavily targeted ethnic Turkmen areas, according to a Reuters data analysis that helps explain rising tensions between Moscow and Ankara in the weeks before Turkey shot down a Russian warplane. Tuesday's incident marked the biggest clash between a NATO member and Russia in half a century, and has drawn threats of economic retaliation from the Kremlin. Turkey says the plane strayed into its ai