with Turkey on the export and local production of the Su-57. On 14 September 2019, an Su-57 took part in the 2019 Technofest festival held in Istanbul. However, on 7 February 2020, President Erdogan announced that the replacement of the F-35 will not be Russian Su-57, but instead will be the Turkish domestic fifth-generation aircraft TF-X fighter. On 27 December 2019, Algeria signed a contract for 14 aircraft as part of large military deal that also includes the purchase of Su-34 and Su-35 fighters. This decision was reportedly taken in summer 2019, when Algerian delegation personally inspected the Su-57 at the MAKS-2019 air show. Once Sukhoi fulfill domestic delivery commitment, Algeria set to receive the first Su-57E in 2028. It has been reported that Vietnam may become a customer of the Su-57. The country is expected to acquire the fighters to replace its aging fleet of 11 Su-27s. On 9 July 2021, Vietnam announced its intention to buy Su-57 aircraft, but it is critical of the aircraft's workmanship. Russia has offered Su-57E fighters to the United Arab Emirates during IDEX 2021. During the 2019 Dubai Air Show, Chemezov talked about the possibility of "localization" of portions of the Su-57 supply chain within other countries that decide to buy those jets, including "…United Arab Emirates, India or Turkey…", depends on the capabilities of the defense industrial base of the customer in question. However, the UAE has refrained from signing a contract with Russia to avoid CAATSA sanctions from the United States. In 2021, Iraqi military leadership including its inspector for the Iraqi Ministry of Defence Imad Al-Zuhairin stated the country's interest in the Su-57. Variants Su-57 Su-57 is the first production variant for the Russian Aerospace Forces. Flight testing began with the T-50 prototype in 2010, and serial production began in 2019. A total of three regiments, 76 aircraft, are planned with the first aircraft delivered in December 2020. Su-57E Su-57E is the export version of Su-57. On 28 March 2019, The aircraft first promoted to international customers during the 2019 Langkawi International Maritime and Aerospace Exhibition. The aircraft was officially unveiled at the MAKS-2019 air show on 28 March 2019. Rosoboronexport is marketing the aircraft as Perspective multirole fighter (PMF). Su-57M Su-57M is an upgraded variant of the base Su-57 under the program name Megapolis, and incorporates improved mission systems, reliability and maintenance enhancements, new flight control actuators, and the