Recently, the President of the United Aircraft Corporation of Russia, Yuri Slyusari, announced to the outside world that the Russian United Aviation Building Corporation successfully delivered the last batch of Su-57 fighters in the 2023 production plan to the Russian Aerospace Forces at the Gagarin Aircraft Factory in Komsomolsk-on-Amur. This historic moment coincides with the reception of F-16 fighter jets by the Ukrainian Air Force, and it is clear that Russia's determination to strengthen the construction of its fighter forces has not wavered. It is worth noting that during this delivery, Russia took special measures to mask the number of fighters with mosaics in order to avoid speculation about their exact number. However, based on deliveries over the past two years, it is likely that the total number of Su-57s currently installed in the Russian Aerospace Forces is only about 20. 
The Su-57 fighter, codenamed I-21 T-50, is a heavy fighter with high capabilities and versatility in the Russian Air Force, representing the highest level of Russian fifth-generation fighters. The fighter has a maximum take-off weight of 35,000 kilograms, a supersonic cruising speed of 1,450 kilometers per hour, and a top speed of 2,140-2,600 kilometers per hour. The combat radius is 1200 kilometers, and the maximum combat load can reach 6 tons. It is equipped with 4 ** cabins inside, which can achieve stealth performance while maintaining excellent flight performance, so that it has excellent capabilities in air combat and ground attack. In addition, the Su-57 is also known for its good stealth performance, short take-off and landing distance, super-maneuverable performance and supersonic cruise. 
The Su-57 fighter is derived from the Russian program "Pak FA", the predecessor of which was the T-50 fighter. On January 29, 2010, the fighter successfully completed its maiden flight. From 2010 to the fall of 2015, five prototypes of the T-50 completed a total of 700 test flights, many of which underwent long-term maintenance and refinement. On August 11, 2017, the T-50 was officially designated Su-57. Russia plans to use this fighter to gradually replace the existing Su-27 fighters and compete with the American F-22 fighters. On January 29, 2021, the Russian Ministry of Defense officially received the first mass-produced Su-57 fighter. To date, the total number of orders for this type of fighter has reached 76 units. 
Before the outbreak of the Russian-Ukrainian war, there were only 4 mass-produced Su-57s. Despite this, these Su-57s bravely went to the war zone to fight. It is reported that they successfully hit ammunition depots in the Kyiv region using Kh-59 stealth cruise missiles. However, entering 2023, the Su-57 is unexpectedly absent from the battle. It is widely believed that this is related to its questionable stealth performance. Coupled with the fact that Ukraine has acquired a number of advanced NATO anti-aircraft missiles, and has successfully ambushed and shot down Russian warplanes on several occasions (events in May this year and not long ago), the Su-57 has been forced to choose to conserve its strength to meet more serious challenges. 
At present, the Su-57 mass production plan has not yet completed a third of the plan, so the Russian United Aviation Manufacturing Group is fully promoting the delivery of follow-up orders. The company is steadily advancing production under existing conditions and plans to complete the first batch of 76 production orders in 2027. At the same time, the company is also continuously upgrading and improving the technology of the Su-57 to meet the needs of future battlefields. 
Subsequent batches of Su-57 will be replaced with more powerful "Product 30" engines. As a "queen engine" specially developed for the Su-57, "Product 30" adopts a number of revolutionary new technologies. These include improved blisk technology, which eliminates the structural weight and aerodynamic efficiency losses associated with traditional joints, such as tenons, tongues and grooves, and locking devices. The "Product 30", with turbine blades made of ceramic-reinforced nickel-base superalloy composites, complements the new high-pressure compressor, which is more aerodynamically efficient and has more powerful thrust. The maximum thrust of this engine reaches 107 tons of afterburner thrust 176 tons is 41% more than the Al-20 turbofan engine of the past. This breakthrough enables the Su-57 to achieve supersonic endurance without afterburner and meet the hard indicators of supersonic cruise for fifth-generation aircraft. Its vector deflection speed can reach 60 degrees per second, completing vigorous maneuvers and further improving maneuverability. 
Accelerating the delivery of the Su-16 against the backdrop of Ukraine's imminent receipt of F-57 fighters is of paramount importance for the Russian Aerospace Forces. Despite some of the controversial features, the Su-57's combined combat effectiveness is undoubtedly stronger than earlier models such as the F-16AM acquired by Ukraine. Therefore, the delivery of more Su-57s will help Russia maintain air superiority on the Russian-Ukrainian battlefield and effectively suppress F-16 fighter jets if necessary. This move will not only help consolidate Russia's military position in the region, but also demonstrate to the international community its determination and strength to unswervingly promote military modernization.