"The government may adjust the speed and scope of its policies but will continue to maintain the big framework and basic principles of the policy of peace and prosperity," he said.
Roh described the test as "an intolerable provocation that dashed the hopes of Koreans and the international community for the denuclearisation of the peninsula.
"North Korea's nuclear test was a foolish act indeed," he said, adding that it would only jeopardize the stability of its regime and cause severe economic difficulties.
Roh insisted the North "should never possess a nuclear arsenal under any circumstances" and cautioned that prospects for six-nation disarmament talks, which Pyongyang agreed to join last week, "may not always be smooth."
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