Q+A: Why is North Korea getting so angry?

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SEOUL (Reuters) – Isolated North Korea announced this week it will shut its border with the South and the international community could not remove samples from a nuclear plant to check whether it is still producing material for weapons.

It said the question of taking samples out of the country impinged on its sovereignty.

There were also reports on Thursday it had begun restricting visitors from China, the nearest it has to a powerful ally, including virtually closing off one of its main border crossings.

http://www.reuters.com/article/worldNews/idUSTRE4AC19Q20081113?virtualBrandChannel=10112