President Barack Obama is urging North Korean leaders to "have the courage to pursue peace" and warning the country that provocation will lead to condemnation of the international community.
Obama says North Korea needs to change its ways because continuing down the same path will lead to "more broken dreams" and "more isolation" for the country.
Obama says in a speech at Hankuk University that the international community has made progress in reducing the threat of nuclear material but says "we're under no illusions."
He says the US has more nuclear weapons than needed but security remains possible even with further reductions.
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