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Russian President Vladimir Putin holds a press conference at the end of the G20 Leaders Summit in Hangzhou on September 5, 2016.
Russian President Vladimir Putin holds a press conference at the end of the G20 Leaders Summit in Hangzhou on September 5, 2016.

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    Sources: U.S. ramping up espionage on Russia

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Sources: U.S. ramping up espionage on Russia

CNN has learned U.S. intelligence agencies are increasing efforts to gather much needed clandestine information about Russia.. CNN's Jim Sciutto reports.

Sources: U.S. ramping up espionage on Russia

CNN has learned U.S. intelligence agencies are increasing efforts to gather much needed clandestine information about Russia.. CNN's Jim Sciutto reports.