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FILE PHOTO - Moscow - Russia - May 7, 2017 - Russian army S-400 Triumph medium-range and long-range surface-to-air missile system rehearse before the World War II anniversary in Moscow. REUTERS/Maxim Shemetov/File Photo(reuters_tickers)
MOSCOW (Reuters) - 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 Thursday.
(Reporting by Polina Devitt; Editing by Andrew Osborn)