https://aviationweek.com/themes/custom/particle/dist/app-drupal/assets/awn-logo.svg The Su-57 engine needs an afterburner to reach supersonic speeds, according to the CEO of Arkhip Lyu-lka Design Bureau, which is developing the powerplant. During a June speech about turbofan engines for Russian tactical combat aircraft, the CEO of Arkhip Lyulka Design Bureau revealed an important detail about the Sukhoi Su-57 engine, the Saturn AL-41F-1: It requires an afterburner to reach supersonic cruising speed.

https://aviationweek.com/defense-space/aircraft-propulsion/russias-fighter-engine-development-slow-going

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