Did U.S. leave vacuum for Iran, Syria?

A Soviet era tank on its way to a position where Iraqi soldiers say there is a sniper.
A Soviet era tank on its way to a position where Iraqi soldiers say there is a sniper.

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    Did U.S. leave vacuum for Iran, Syria?

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The US isn't doing airstrikes in Iraq. Is there a vacuum for Syria and Iran to step in? CNN's Fareed Zakaria weighs in.