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How does U.S. respond to Russia's military presence in Syria?

The U.S. and NATO are watching Syria over concerns that Russia is beefing up its military presence there. Moscow says it's nothing new, but in recent days, about 100 Russian marines and several transport aircraft arrived at the Assad International Airport in northwest Syria. CBS News senior security contributor and former CIA deputy director Michael Morell joins "CBS This Morning" to discuss the situation.
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