In this file photo taken Wednesday, April 8, 2015, a U.S. military fighter jet participates in a NATO Baltic Air Policing Mission practice mission in the Tapa training area, some 70 kilometers (43 miles) southwest of Tallinn, Estonia. Russia is so close that the F-16 fighter pilots can see it on the horizon as they swoop down over a training range in Estonia in the biggest ever show of U.S. air power in the Baltic countries. (AP Photo/Mindaugas Kulbis)
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