North Korea says it will regard sanctions as a call to war and has threatened more nuclear tests if the US continues its "hostile attitude" towards the communist regime.
The warnings from the reclusive state - which shocked the world by announcing its first nuclear weapons test on Monday - came as South Korea ordered its military to check its readiness for a nuclear conflict.
"The issue of future nuclear tests is linked to US policy toward our country," said Kim Yong Nam, who is second to North Korean leader Kim Jong Il.
"If the United States continues to take a hostile attitude and apply pressure on us in various forms, we will have no choice but to take physical steps to deal with that," Kim said in an interview with Japan's Kyodo News agency.
Earlier, an unnamed North Korean official said it would regard full-scale sanctions as a call to war, Yonhap news agency reported.
"Sanctions are nonsense. If full-scale sanctions take place, we will regard it as a declaration of war," the official said.
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"The more pressure we get, the stronger our response will be."