Speaking to Dermot Murnaghan, Foreign Secretary William Hague has called America's decision to postpone a missile test as "sensible."
I think that is a sensible thing to do, as was the cancellation in South Korea of a live-fire est. One of the dangers here is of a miscalculation and of the North Korean regime coming to believe their own paranoid rhetoric.
So I think that sort of action by the United States is sensible. We have to take this seriously, this is a regime developing its nuclear weapons in contravention of all international treaties and resolutions. But our response must be very clear, very measured and calm at all times. It is important not to feed that frenetic rhetoric that we've seen over the last few weeks.
Through her tears, a North Korean woman told me how she had to escape: risk death while running across the border or die of starvation.
Memories of the Korean war are never far away in South Korea, where residents have grown used to living with the constant threat of war.
North Korea said it will withdraw workers from the Kaesong factory park run jointly with South Korea and suspend all operations there.