North Atlantic Treaty Organization (Nato)

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NATO Secretary General Anders Fogh Rasmussen addresses the media after an NATO Ambassadors Council at NATO headquarters in Brussels, Wednesday, April 16, 2014. NATO says it's reinforcing its military presence on eastern border on sea, land and in the air. (AP Photo/Yves Logghe)

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NATO Supreme Allied Commander Europe, U.S. Air Force General Philip Breedlove gestures during an interview with the Associated Press in Paris, Wednesday April 9, 2014, as he talks about his mission to formulate a plan to help protect and reassure NATO members nearest Russia. NATO’s top military commander in Europe, Breedlove is tasked with drafting countermoves to the Russian military threat against Ukraine. (AP Photo/Remy de la Mauviniere)

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NATO Supreme Allied Commander Europe, U.S. Air Force General Philip Breedlove during an interview with the Associated Press in Paris, Wednesday April 9, 2014, as he talks about his mission to formulate a plan to help protect and reassure NATO members nearest Russia. NATO’s top military commander in Europe, Breedlove is tasked with drafting countermoves to the Russian military threat against Ukraine. (AP Photo/Remy de la Mauviniere)

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NATO Supreme Allied Commander Europe, U.S. Air Force General Philip Breedlove speaks during an interview with the Associated Press in Paris, Wednesday April 9, 2014, as he talks about his mission to formulate a plan to help protect and reassure NATO members nearest Russia. NATO’s top military commander in Europe, Breedlove is tasked with drafting countermoves to the Russian military threat against Ukraine. (AP Photo/Remy de la Mauviniere)

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NATO Supreme Allied Commander Europe, U.S. Air Force General Philip Breedlove during an interview with the Associated Press in Paris, Wednesday April 9, 2014, as he talks about his mission to formulate a plan to help protect and reassure NATO members nearest Russia. NATO’s top military commander in Europe, Breedlove is tasked with drafting countermoves to the Russian military threat against Ukraine. (AP Photo/Remy de la Mauviniere)

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NATO Supreme Allied Commander Europe, U.S. Air Force General Philip Breedlove gestures during an interview with the Associated Press in Paris, Wednesday April 9, 2014, as he talks about his mission to formulate a plan to help protect and reassure NATO members nearest Russia. NATO’s top military commander in Europe, Breedlove is tasked with drafting countermoves to the perceived Russian military threat against Ukraine. (AP Photo/Remy de la Mauviniere)

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NATO Supreme Allied Commander Europe, U.S. Air Force General Philip Breedlove gestures during an interview with the Associated Press in Paris, Wednesday April 9, 2014, as he talks about his mission to formulate a plan to help protect and reassure NATO members nearest Russia. NATO’s top military commander in Europe, Breedlove is tasked with drafting countermoves to the Russian military threat against Ukraine. (AP Photo/Remy de la Mauviniere)

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NATO Supreme Allied Commander Europe, U.S. Air Force General Philip Breedlove gestures during an interview with the Associated Press in Paris, Wednesday April 9, 2014, as he talks about his mission to formulate a plan to help protect and reassure NATO members nearest Russia. NATO’s top military commander in Europe, Breedlove is tasked with drafting countermoves to the perceived Russian military threat against Ukraine. (AP Photo/Remy de la Mauviniere)