Earlier on Tuesday, Mr Mandela signed the visitor's book at Aras An Uchtarain, the home of Irish heads of state, and then had 20 minutes of private talks with Mrs McAleese.

BBC: Mandela urges NI peace

In the few minutes she talks about the careful curation of the wine list, her passion and deep understanding of wine is electrifying.

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But while America has continued to reject North Korea's demands for one-to-one talks, Mr Kelly was said to have had at least one bilateral meeting, lasting 30-40 minutes, with his North Korean counterpart at the margins of the Beijing talks.

ECONOMIST: Jaw-jaw beats nuclear war | The