(2)
(a) Russia will supply first four Su-35 fighters to China by end of 2016 — source. Tass, Feb 19, 2016. http://tass.ru/en/defense/857813
Note: "Its [Su-35's] maximum speed is 2,390 km/h (1,490mph)"
speed of sound https://en.wikipedia.org/wiki/Speed_of_sound
("In dry air at 20 °C, the speed of sound is 343.2 metres per second (1,126 ft/s). This is 1,236 kilometres per hour (768 mph)")
(b) AIRSHOW-Indonesia picks Russian Su-35 to modernise air force-sources. Reuters, Feb 19, 2016 http://www.reuters.com/article/s ... hters-idUSL3N15Y2AN
(an agreement at the Singapore Airshow, with a contract to be signed in a month)
Note: The Reuters report doesnot mention transfer of technology (TOT). Some other (English-language) news media do, but are vague about what or whether even related to Su-35. "Russia also took the opportunity to convince Indonesia to buy weaponry systems, including Sukhoi SU-35 fighter jets, helicopters and submarines, alongside transfer of technology to help improve Indonesia’s defense industry." Jakarta Post, Feb 11, 2016.