The Russian MiG-35 “Fulcrum-F,” intended as an advanced 4.5-generation upgrade to the MiG-29, has been a significant failure for Moscow’s defense industry. -Plagued by technical deficiencies, ...

Russia’s Su-57 “Felon,” conceived as the answer to America’s F-22 Raptor, has been a deeply troubled and largely unsuccessful fifth-generation fighter program. -Plagued by persistent delays, ...