What is the Russian S-400 air defense system, and why is the U.S. upset Turkey bought it?

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A Russian plane carrying the first components of the S-400 surface-to-air defense system landed in Turkey on Friday, in a move that is opposed by the Pentagon and could damage Turkey’s relationship with the United States and other NATO allies.




SOURCE: What is the Russian S-400 air defense system, and why is the U.S. upset Turkey bought it?

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