But such unofficial meetings provide a back channel for discussions between North Korea and the us, which do not have diplomatic relations.

但这种非官方的会谈为未建立大使关系的朝美提供了一种隐蔽的谈判渠道。

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The US and South Korea have held a series of joint military exercises since the Cheonan incident, prompting the North to threaten to retaliate.

“天安”舰事件后，美韩举行了一系列的联合军事演习，并威胁使用武力。

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The urgent matter for North Korea and the US is to establish the relation of mutual trust.

目前唯一突破朝美两国之间的问题就是建立信任关系。

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The US and North Korea accuse each other of failing to abide by the agreement.

BBC: 'Path open' for North Korea talks, neighbours say

This concerning pattern occurs in the absence of any regular engagement between the US and North Korea.

BBC: Viewpoint: What is driving North Korea's threats?

North Korea says the rocket carried a communications satellite into space, but the US and North Korea's neighbours have long believed such operations represent attempts by Pyongyang to develop long-range missiles.

BBC: North Korea rocket 'was domestically made'