In the year 1995 a production agreement for 200 Soviet Su-27SK was secured by China, but those Fighters must be equipped with Russian avionics and engines, which had to be built in Russia. China was now able to built 95 J-11 aircraft, while 105 were planned to be produced. As in 2004 development for a own variant the J-11B started, Russia cancelled the arrangement in 2006. The China had started developing the J-11B because the conventional J-11 is not able to carry modern weapons and that it would not meet all the PLAAF´s requirements. China states that the J-11B is a 90 % new Chinese design.