After years of provocations, talks, promises and broken vows — a pattern that Pyongyang has mastered — the atmosphere on the Korean Peninsula remains highly charged and little changed.
But the same question remains: What can be done about North Korea?
With its fourth nuclear test and rocket launches that critics say mask a drive to create a long-range missile capable of striking the United States, North Korea's recent repeated acts of belligerence are a familiar refrain.
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