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A pro-Russian protester burns tires in prepararation for battle with the Berkut (Ukrainian special police forces) on the outskirts of the eastern Ukrainian city of Slavyansk on April 13, 2014. Ukraine on April 13 launched an “anti-terrorist operation” in the eastern town of Slavyansk, where pro-Russian gunmen have seized police and security services buildings, Interior Minister Arsen Avakov said. AFP PHOTO / ANATOLIY STEPANOV