MiG-29 jet fighters of the Strizhi (Swifts) and Sukhoi Su-27 jet fighters of the Russkiye Vityazi (Russian Knights) aerobatic teams perform near an Orthodox church during a demonstration flight at the MAKS International Aviation and Space Salon in Zhukovsky outside Moscow, Russia in this August 28, 2013 file photo. The MAKS International Aviation and Space Salon 2015 is expected to open in Russia this week. (Photo by Tatyana Makeyeva/Reuters)
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