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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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    Russia says defense system could stop strike

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Russia says defense system could stop strike

CNN's Tom Foreman says Russia's defense system, known as "The Grumble," could have possibly stopped US missile strikes against the Syrian government, if the Kremlin chose to use it.

Russia says defense system could stop strike

CNN's Tom Foreman says Russia's defense system, known as "The Grumble," could have possibly stopped US missile strikes against the Syrian government, if the Kremlin chose to use it.