John Kerry

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U.S. Secretary of State John Kerry speaks during a news conference at NATO Headquarters in Brussels Tuesday April 1, 2014. (AP Photo/Jacquelyn Martin, Pool)

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U.S. Secretary of State John Kerry, right, meets with Ukrainian Foreign Minister Andriy Deshchytsia before their meeting at NATO Headquarters in Brussels, Tuesday April 1, 2014. (AP Photo/Jacquelyn Martin, Pool)

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U.S. Secretary of State John Kerry speaks during a news conference at NATO Headquarters in Brussels, Tuesday April 1, 2014. (AP Photo/Jacquelyn Martin, Pool)

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U.S. Secretary of State John Kerry, right, shakes hands with Ukrainian Foreign Minister Andriy Deshchytsia before their meeting at NATO Headquarters in Brussels, Tuesday April 1, 2014. (AP Photo/Jacquelyn Martin, Pool)

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U.S. Secretary of State John Kerry speaks during a news conference at NATO Headquarters in Brussels, Tuesday April 1, 2014. (AP Photo/Jacquelyn Martin, Pool)

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U.S. Secretary of State John Kerry speaks during a news conference at NATO Headquarters in Brussels Tuesday April 1, 2014. (AP Photo/Jacquelyn Martin, Pool)