North Korea should not play "hide and seek" with inspectors but come clean on all its nuclear facilities, including its clandestine uranium enrichment programme, according to Christopher Hill, the US envoy who negotiated this week's landmark disarmament agreement.

Speaking to the FT on his return to Washington, Mr Hill said the US wanted more clarity from Pyongyang on its uranium enrichment when the six parties reconvene in November to discuss how to verify the dismantling of all its nuclear weapons and programmes.