The designation Su-35 has long been known in the world of aviation. Upgraded Su-27M fighters developed on order by the Russian Air Force have been displayed at international air shows repeatedly since 1992 under that name. On the verge of the new millennium, Su-35 competed in the tenders issued by the South Korean and Brazilian air forces, with aircraft made as far back as the early ‘90s acting as technology demonstra-tors. With the passage of time, it became clear that the aircraft needed a drastic upgrade of both its avionics and weapons to its airframe and powerplant for the aircraft to penetrate the global market and put up competition to the up-to-date and future foreign fighters. The latter was to be ensured by a consider-able increase in the fighter’s service life. As a result, a concept of a comprehensively upgraded fighter of the Su-27 family, retain-ing the Su-35 designation, had matured by the middle of the first decade of the new century.