Helicopter of Netherlands participates in NATO's Dynamic Mongoose anti-submarine exercise in the North Sea off the coast of Norway, May 4, 2015. NATO launched one of its biggest-ever anti-submarine exercises in the North Sea on Monday, inviting non-member Sweden for the first time, amid increasing tensions between Russia and its northern neighbors. More than a dozen vessels from 11 countries are participating in the “Dynamic Mongoose” exercise. (Photo by Marit Hommedal/Reuters/NTB Scanpix)
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