Note: The Su-57 never featured s-ducts, a feature common in all modern stealth aircraft. In the last image, it is shown that the Russians decided to use grid-like devices to hide the engine fan blades of the aircraft. Although the Su-57 is considered a fifth-generation aircraft, it is very apparent that it does not feature many of the RCS reducing features found on other fifth-generation aircraft like the F-35, F-22, or J-20.