As of now, the United States is the only country whose Air Force includes a fully-operational fifth-generation jet fighter.
“We have plans to deliver the first series of fifth-generation fighter jets next year,” Borisov said during a visit to the Komsomolsk-on-Amur aviation plant in the country’s Far East, where Russia is developing the PAK-FA fighter jet.
Borisov added that four more prototypes will be available for tests this year, after manufacturers said last month that five fighters were carrying out test flights.
Fifth-generation military jet aircraft incorporate stealth profiles, advanced avionics and all-digital flight systems.
The US Air Force's F-22 Raptor, introduced in 2005, remains the only combat-ready fifth-generation fighter in existence.