S.Korea gravely concerned at North's test threat
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South Korea said on Wednesday it was gravely concerned over North Korea's plans to test a nuclear bomb, with the United States saying the move would be "an unacceptable threat" to world peace.
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The UN nuclear watchdog has said South Korea has been illegally conducting secret nuclear tests on a larger scale than Seoul had previously declared.
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Signs that North Korea is preparing to test a ballistic missile are of great concern, a US commander said on Sunday, adding that the North could be on the verge of big missile technology breakthroughs.
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South Korea reacted with shock and  suspicion on Friday to the first declaration from the reclusive  North that it had nuclear weapons and had pulled out  indefinitely from six-party disarmament talks.
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South Korean and US military authorities are on alert as North Korea appears to be preparing to test-fire a missile, the Defense Ministry said yesterday.
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There is concern in Japan and South Korea that North Korea might be preparing to launch a ballistic missile. Officials in both Japan and South Korea say that since Tuesday, they have detected signs of activity
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A huge explosion rocked North Korea last week but U.S. and South Korean officials said on Sunday it was unlikely to have been a nuclear weapons test despite the appearance of a "peculiar cloud" over the area.
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The United States in its starkest warning so far said on Wednesday it would not live with a nuclear-armed North Korea, while Japan and other neighbors hardened their responses after the reclusive state announced it planned a nuclear test.
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A nuclear test by North Korea would pose  an "unacceptable threat" to peace and stability in the world  and further isolate the reclusive nation, the U.S. State  Department said on Tuesday.
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North Korea lashed out Tuesday at ongoing U.S.-South Korean military drills and warned that it could take retaliatory action amid renewed concern that the communist nation may be preparing to test a nuclear bomb.
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South Korean and US military authorities are on alert as North Korea appeared to be preparing to test-fire a missile as part of a routine military drill, the defence ministry said.
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North Korea, citing American belligerence and pressure, said Tuesday it will conduct a nuclear test.
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South Korea reacted with shock and suspicion on Friday to the first declaration from the reclusive North that it had nuclear weapons and had pulled out indefinitely from six-party disarmament talks.
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South Korea's president warns against confronting North Korea, as pressure builds in Japan for sanctions.
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Japan pressed on with efforts on Thursday to secure a U.N. condemnation of North Korea's nuclear test threat after Washington, in its starkest warning so far, said it would not live with a nuclear-armed Pyongyang.
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North Korea is threatening to use  terrorism against the South, Seoul's intelligence agency said  in a rare public advisory on Monday, and warned South Korean  citizens in China and Southeast Asia to be on their guard.
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North Korea threatened on Friday to take   "stronger physical actions" after Japan imposed punitive   measures in response to its barrage of missile tests and pushed   for international sanctions at the United Nations.