Article published on the 2009-05-27 Latest update 2009-05-27 14:58 TU
North Korea's anger follows South Korea's decision to join a US-led international security initiative, established after the 11 September attacks to stop the proliferation of weapons of mass destruction.
"It's hard to say it's a genuine menace," said correspondent Eban Ramstad, referring to whether Pyongyang's threats of a military attack were seen as genuine.
However, the fact that North Korea did issue a warning "is a sign that their anger is relatively higher now," Ramstad said on the line from Seoul, South Korea.
The possibility of an attack is being taken seriously as British Foreign Secretary David Miliband called on the United Nations Security Council to hold firm against North Korea's defiant nuclear and missile tests.
"There is an absolute premium on maintaining unity in the face of this provocation from North Korea," said Miliband at a news conference in Ankara, Turkey on Wednesday.
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