In 2017, the Su-35S fighters will be refined with regard for the combat usage in Syria, Russia`s Deputy Defense Minister Yuri Borisov said. "The planes of this year will be refined with due account for the Syrian experience and drawbacks. We may even delay the acceptance of the aircraft in service before the confirmation of the troubled issues correction," Borisov said during his visit to the Komsomolsk-on-Amur Aviation Plant named after Yuri Gagarin (KnAAZ). Read more