MOSCOW (Reuters) - Russia has sold its advanced S-400 air defense missile system to Turkey for over $2 billion, Sergei Chemezov, the head of state conglomerate Rostec, said on Thursday, the TASS news agency reported. The deal with Turkey, a NATO member, has caused some disquiet in the United States. Turkey originally awarded a $3.4 billion contract for a defense system to China in 2013, but canceled that two years later, saying it would concentrate on developing a system domestically. 
रूस एस-400 वायु रक्षा मिसाइलों के लिए तुर्की से 2 अरब डॉलर चाहता हैः टीएएसएस