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North Korea has issued a series of threats in recent weeks in response to tougher U.N. sanctions and joint military exercises by the United States and South Korea.
Pyongyang has said it plans to place military units tasked with targeting U.S. bases under the highest alert.
The reclusive nation carried out a long-range rocket launch in December and an underground nuclear test last month, prompting the U.N. Security Council to step up sanctions.
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