US Secretary of State John Kerry has said he wants to see North Korea take responsible actions towards achieving peace rather than threatening to abrogate armistice agreements.
Speaking in Qatar, Kerry said he hoped the North Koreans would engage in negotiations to resolve world concerns.
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The encounter in Havana airport is the first between the heads of the two branches of Christianity since a schism nearly a thousand years.
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Run by the NSPCC the helpline allows employees in any sector to raise concerns anonymously.