reportedly ended in 2004 because China was developing the J-11B - a variant with domestic subsystems - in violation of the coproduction agreement. At the time, Russia refused to comment on the manufacturing of J-11B. At MAKS 2009, Rosoboronexport's General Manager Anatoli Isaykin said Russia and Sukhoi would "investigate the J-11B, as a Chinese copy of the Su-27". At the 2009 Farnborough Airshow, Alexander Fomin, Deputy Director of Russia's Federal Service for Military-Technical Co-operation, reported that Russia had not asked China about the "copying" of military equipment and that China had licenses to manufacture the aircraft and its components, including an agreement on the production of intellectual property (IP) rights. He also confirmed the existence of an all-encompassing contract and an ongoing licensed production of the Su-27 variant by the Chinese. This previously undisclosed IP agreement fuelled speculation about secret contracts or clauses in the original contract. The licence does not officially include carrier-capable aircraft (eg. Sukhoi Su-33) or variants (eg. Shenyang J-15). J-11B The J-11B "Flaming Dragon" is a multirole variant of the J-11 incorporating Chinese subsystems. It was conceived as a way to remove the J-11's dependency on Russia. SAC unveiled a J-11B mockup in mid-2002. Three prototypes were delivered to the PLAAF for testing in 2006. The two-seater J-11BS followed two years after the J-11B. By 2011, reportedly 90% of the J-11B was based on subsystems and parts designed in China, with the engine presumably being a major part of the remainder. Many domestic subsystems are improvements of those found on the Su-27SK. Chinese subsystems on the J-11B include Type 1474 radar, 3-axis data system, power supply system, emergency power unit, brake system, hydraulic system, fuel system, environment control system, molecular sieve oxygen generation systems, digital flight control system, and glass cockpit. The airframe is slightly lighter due to greater use of composites. The J-11B may carry the PL-12 and PL-15 air-to-air missiles Engine replacement By 2004, the J-11 was being tested with the Shenyang WS-10. Testing may have started as early as 2002; an image from the 2002 China International Aviation & Aerospace Exhibition allegedly depicted a J-11 with one engine replaced with a WS-10. WS-10 development proved difficult. One regiment converted to WS-10-powered J-11Bs in 2007, but was grounded for an extended period due to poor operational reliability. The WS-10A reportedly matured enough after 2009 to power the J-11B Block 02 aircraft, and Jane's reported