“Last year we signed a long-term contract for the delivery of the Su-35S aircraft, this year we are planning to receive 10 Su-35S jets, while four Su-27s will be upgraded to the Su-35,” Borisov, who visited the Komsomolsk-on-Amur aircraft manufacturing plant earlier in the day, told reporters.
Source: Russian Aerospace Forces to Get 10 New Su-35S Super maneuverbale Fighters in 2017