 In the early 1980s , while the Su @-@ 27 was entering service with the Soviet Air Forces , Sukhoi looked to develop a follow @-@ on variant . Originally designated " Su @-@ 27M " and known internally as the " T10 @-@ M " , it would be much more agile and feature greatly improved avionics compared to the aircraft considered to be the best contemporary fighter . It was also to carry more armament to improve its Air @-@ to @-@ ground weaponry capabilities . 
