China may become first buyer of S-400s - Russian official

China may become the first buyer of Russia's S-400 anti-aircraft missile system, the Kremlin's chief of staff Sergei Ivanov said on Thursday."Chances that China may be the first foreign buyer [of S-400s] are high," he told reporters.S-400, a new-generation long and medium-range anti-aircraft missile system, is capable of destroying all the existing air attack weapons, including tactical and strategic aircraft, ballistic missiles and hypersonic targets.