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Russia is claiming that its T-50 stealth fighter will enter production late next year:

A contract for the serial production of the fifth-generation T-50 PAK FA fighter jet at the Komsomolsk-on-Amur Aircraft Plant is planned to be signed before the end of 2017, Governor of Russia’s Khabarovsk Territory Vyacheslav Shport said.

………

Russian Aerospace Force Commander-in-Chief Viktor Bondarev said earlier that the serial production of the T-50 fighter jet would begin in 2017.

According to the commander, the PAK FA fighter jet will be made operational with the Aerospace Force in 2017 as well.

This is pixie dust.

They are still not flying the aircraft with its intended power plant, and they are suggesting that it will enter service in a year.

Additionally, the current prototypes are still hand built.

Stepping up to mass production from this is a monumental task, particularly given the large portion of the skin and airframe made of composites, and the need to maintain tight tolerances to reduce radar signature.

This would be the first for a mass produced Russian aircraft.

It can be done, but it cannot be done in just 1 year.