Sukhoi Su-35 The initial success of this project led Sukhoi in December 2003 to proceed with a follow-up modernization programme. Known internally as T-10BM, the programme was aimed at a more thorough redesign of the airframe to narrow the qualitative gap between Russian aircraft and foreign so-called fourth-generation aircraft. The resultant design, also designated Su-35, would serve as an interim solution pending the introduction of the Sukhoi Su-57 fifth-generation fighter, many features of which the aircraft would incorporate. Additionally, the aircraft was to be a single-seat alternative to the two-seat design of the Su-30MK on the export market. In many respects, the
Sukhoi Su-57 produced, and some believe it to be an implicit announcement of the project's cancellation. The slowing of procurement could be because of the current slow growth of the Russian economy, while the future patches' procurement are for an unknown future; the Russian military could be waiting for the more powerful Saturn izdeliye 30 engine to be ready for serial production. On 22 August 2018, during the International Military-Technical Forum «ARMY-2018», the Russian Ministry of Defence and the JSC Sukhoi signed the first contract for delivery of two serial Su-57s. The contract should be finalized between 2018 and 2020. The prototype's