FILE - In this Friday, March 4, 2016 file photo, Russian fighter jets and bombers are parked at Hemeimeem air base in Syria. Russian warplanes have mostly stayed on the ground since the Russian- and U.S.-brokered cease-fire has begun last weekend. Russia's defense ministry said Tuesday, March 15, 2016, that the first group of warplanes stationed at the Russian air base in Syria has left for home following a pullout order from President Vladimir Putin. (AP Photo/Pavel Golovkin, File)
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