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A video has surfaced of ISIS shooting down a Russian military helicopter near Palmyra, Syria, killing both pilots.
The men have been named as Ryafagat Khabibulin and Yevgeny Dolgin.
The Mi-25 aircraft was reportedly conducting a test flight in the area when it received a request for assistance from the Syrian military, who were under attack from group of Isis militants to the east of Palmyra .