Russia has started delivering its S-400 surface-to-air missile system to China under the terms of a contract signed in 2014, the TASS news agency cited an unnamed source in the Russian military-industrial complex as saying on January 18.
Reuters: Russia starts shipping S-400 air defense missile system to China
This handout picture obtained from the Russian Defence Ministry's official Facebook page on Nov. 26, 2015 shows Russia's S-400 air defence missile systems standing at an airfield at the Hmeimim airbase in the Syrian province of Latakia.