Why Russia's Su-57 Stealth Fighter Crashed

On December 24, 2019, a sleek-looking Su-57 stealth fighter designated Blue 01 took to the skies for an engine test flight from Dzemgi airport in eastern Russia. Manufacturer Sukhoi had already built ten T-50 prototype aircraft for Russia’s PAK FA stealth fighter program, and had even twice deployed them to Syria for combat tests.

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