The US has announced it
is moving an advanced missile defence system to the Pacific island of
Guam as North Korea steps up its warlike rhetoric.
The latest statement from Pyongyang "formally informs" the Pentagon it has "ratified" a possible nuclear strike.North Korea has threatened to target the US and South Korea in recent weeks.
Its latest statement came amid warnings from US Defence Secretary Chuck Hagel that North Korea is a "real and clear danger" to the US and its allies.
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