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    AP: Russia watched Tsarnaev during trip

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AP: Russia watched Tsarnaev during trip

CNN's Nick Paton Walsh reports on Tamerlan Tsarnaev's six-month visit to Russia and who he might have met there.

AP: Russia watched Tsarnaev during trip

CNN's Nick Paton Walsh reports on Tamerlan Tsarnaev's six-month visit to Russia and who he might have met there.