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. https://nationalinterest.org/blog/buzz/rip-russias-stealth-fighter-why-su-57-serious-trouble-43542
blog article
RIP RUSSIA'S STEALTH FIGHTER: WHY THE SU-57 IS IN SERIOUS TROUBLE
Combined with the dramatic collapse of the Russian economy in the wake of Western economic sanctions following the Russian invasion of Ukraine, the inflexibility of UAC made the Su-57 impossible to realize. TOM COOPER READ MORE