Russian engineers are going to develop the main engine for the T-50 fifth-generation jet by 2020.

Research and development work for main engines of Russia's Sukhoi T-50 (PAK FA) fifth-generation fighter jets is scheduled to be completed by 2020, the head of the United Engine Corporation said Friday.

"This year we plan to begin tests as part of a flight laboratory. R&D completion is planned by 2020," Alexander Artyukhov said at the unveiling of an advanced MiG-35 multirole fighter.

The PAK FA fighter was first seen in January 2010 when it was presented at the air show MAKS-2011. Mass production of Russia’s Sukhoi T-50 fifth-generation fighter jets will begin in 2017.