The Diplomat:
The Sukhoi Su-57 fighter aircraft, Russia’s first purported indigenously designed and built fifth-generation stealth fighter jet, will not enter serial production before 2020, according to a Russian military aviation industry source.
“In 2020, we plan to sign the second contract to manufacture and deliver 13 Su-57 fighter jets, some of them equipped with the second-stage engines,” the source was quoted as saying by TASS news agency in a January 16 report. “The preliminary time frame for the new contract is five years.”
Two aircraft are expected to be delivered to the Russian Air Force in 2019 and 2020 respectively. “In line with the contract signed in 2018, one serial Su-57 jet with first-stage engines will be delivered to the [Russian] Aerospace Forces this year, the other aircraft featuring the same type of engine – in 2020,” the source said.