Turkey to listen to US concerns over S-400s

The United States will send a technical team to Turkey in the coming weeks to express specific concerns over the latter's purchase of the Russian S-400 air defense systems particularly in regards to the flight safety of the U.S.'s F-35 aircraft, the head of the Turkish defense industry body has said, in a development that followed the U.S.'s Patriot missile system offer to the Turkish government. 

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