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U.S. President Barack Obama gestures during his and Estonian President Toomas Hendrik Ilves's news conference at the Bank of Estonia in Tallinn, Estonia, Wednesday, Sept. 3, 2014. Wednesday's statement came as U.S. President Barack Obama arrived in Estonia in a show of solidarity with NATO allies who fear they could be the next target of Russia's aggression. (AP Photo/Mindaugas Kulbis)
U.S. President Barack Obama gestures during his and Estonian President Toomas Hendrik Ilves's news conference at the Bank of Estonia in Tallinn, Estonia, Wednesday, Sept. 3, 2014. Wednesday's statement came as U.S. President Barack Obama arrived in Estonia in a show of solidarity with NATO allies who fear they could be the next target of Russia's aggression. (AP Photo/Mindaugas Kulbis)

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