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Although it's still struggling with the PAK FA, Russia is already working on 6th and 7th generation fighters - The Aviationist
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Up close and personal with Russia's 5th generation stealth fighter: first close-up pictures of the PAK-FA - The Aviationist
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Will Vietnam Really Acquire Up to 24 Russian PAK FA Stealth Fighters Soon? - 22.06.2017, Sputnik International
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