South Korean President Moon Jae-in says Seoul will actively try to get the nuclear negotiations between Washington and Pyongyang quickly back on track.

Moon made the comments on Monday as he led a National Security Council meeting to discuss South Korea's diplomatic strategy following the breakdown of a high-stakes summit between President Donald Trump and North Korean leader last week in Vietnam.

Moon lobbied hard for the revival of nuclear diplomacy between Washington and Pyongyang following a period of tension over the North's missile and nuclear tests and Trump's threats to bring down "fire and fury" on the North.

But experts say the breakdown of the Trump-Kim meeting in Hanoi has put the credibility of Moon's role as mediator in doubt.

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