The Su-57 fighter jet (design code: I-21/T-50) is a single seat twin engine stealth multifunctional heavy fighter jet of the Russian Air Force, and is the fifth generation fighter jet of Russia (referred to as the fourth generation fighter jet in Western countries).The Su-57 fighter jet has a maximum takeoff weight of 35000 kilograms, a supersonic cruising speed of 1450 kilometers per hour, a top speed of 2140-2600 kilometers per hour, a combat radius of 1200 kilometers, a combat payload of 6 tons, and is equipped with four weapon compartments, which can achieve a good combination of flight performance and stealth performance, and has the ability to engage in aerial combat and ground attacks. It has the characteristics of good stealth performance, short takeoff and landing distance, super maneuverability, and supersonic cruise control. [2] [2] [3] [4] [5] [1] [6] [7] [8]The Su-57 fighter jet was developed from the Russian PAK FA program and was formerly known as the T-50 fighter jet. It made its maiden flight on January 29, 2010; From 2010 to the autumn of 2015, five prototypes of the T-50 completed 700 test flights, with multiple prototypes undergoing lengthy maintenance; On August 11, 2017, it was officially named Su-57; Russia plans to replace the Su-27 fighter jet with this type of fighter jet to compete with the US F-22 fighter jet. On January 29, 2021, the Russian Ministry of Defense officially took over Russia's first mass-produced Su-57 fighter jet.