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Few statements are as likely to explode the online comment section as "the F-35 is a billion-dollar aircraft that can't engage in air combat" and "the Su-57 is not a fifth-generation fighter." The Russian Sukhoi Su-75 has the same potential to spark heated debate. But in a world where America is considering retiring its oldest fifth-generation fighters and is preparing to test-fly its sixth-generation fighters, Russia is still talking about producing a low-end fifth-generation fighter by the end of the decade.