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An S-300 PMU-1 anti-aircraft missile launches during a Greek army military exercise near Chania on the island of Crete on December 13, 2013. Greece is the first NATO country to try the Russian long-range missile system. AFP PHOTO / Costas Metaxakis (Photo credit should read Costas Metaxakis/AFP/Getty Images)
An S-300 PMU-1 anti-aircraft missile launches during a Greek army military exercise near Chania on the island of Crete on December 13, 2013. Greece is the first NATO country to try the Russian long-range missile system. AFP PHOTO / Costas Metaxakis (Photo credit should read Costas Metaxakis/AFP/Getty Images)

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    Is Iran getting a Russian missile system?

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Is Iran getting a Russian missile system?

U.S. officials are concerned that Russia is planning to sell Iran a sophisticated missile defense system. CNN's Barbara Starr reports.

Is Iran getting a Russian missile system?

U.S. officials are concerned that Russia is planning to sell Iran a sophisticated missile defense system. CNN's Barbara Starr reports.