Sales discussions were protracted due to intellectual property rights concerns. China had reverse engineered the Su-27SK and Su-33 to create the J-11B and J-15, respectively, there were fears of China copying the airframe and offer the copied design on the export market. At one stage, Rosoboronexport demanded that China issue a legally binding guarantee against copying. Chinese industry was reportedly interested in the AL-41FS1 engine and Irbis-E radar. According to The Diplomat, China held a specific interest in the Su-35's engine, and was already test-flying the J-11D, which reportedly has less range, payload, and maneuverability than the Su-35 but has an active electronically scanned array radar instead of the less advanced PESA radar of the Su-35. Rosoboronexport insisted on China purchasing a minimum of 48 aircraft to offset risks of copying; after the Kremlin intervened in 2012, the minimum quantity was lowered to 24. Another problem was China's insistence that the Su-35 include Chinese-made components and avionics. The Kremlin again intervened and conceded to this demand, allowed the deal to proceed; it was viewed as a major concession since the sales of such components are reportedly lucrative. The contract did not include any technology transfer. The Chinese military received the first four aircraft in December 2016. Followed by the first delivery, the People's Liberation Army's website opined that with the J-20's commissioning, Russia understood that the Su-35 would "lose its value on the Chinese market in the near future...we hope very much that Su-35 will be the last (combat) aircraft China imports." China has received a second batch of ten aircraft in 2017, and another ten in 2018. The Su-35S entered service with PLAAF in April 2018, and are based in Guangdong province in southeast China. In June 2019, Russia offered China a second batch of Su-35s. According to Asia Times, Chinese source remarked further purchase of Su-35 is not feasible as Russian jet offers little value over the Chinese J-16, due to the latter having superior radar, avionics and other equipment. On 20 September 2018, the U.S. imposed sanctions on China's Equipment Development Department and its director, Li Shangfu, for engaging in ″significant transactions″ with Rosoboronexport, specifically naming China's purchase of ten Su-35s in 2017 as well as S-400 surface-to-air missile system-related equipment in 2018. Egypt In March 2019, it was reported that Egypt would procure "over two dozen" Su-35s from Russia in a deal valued about $US2 billion,