So, a senior UN envoy visited North Korea the order day in an effort to calm the escalating tension between North Korea and America.

The senior diplomat has warned that there is a grave risk that a miscalculation could trigger conflict with North Korea.

He therefore urged Pyongyang to keep communication channels open after a rare visit to the reclusive state.

The senior envoy, Jeffrey Feltman's trip to the North -- the first by such a high-ranking UN diplomat since 2010 -- kicked off less than a week after Pyongyang said it test-fired a new ballistic missile capable of reaching the US.

The United Nations said Feltman met North Korea's Foreign Minister Ri Yong-Ho and Vice Foreign Minister Pak Myong-Kuk and they "agreed that the current situation was the most tense and dangerous peace and security issue in the world today".

Noting the "urgent need to prevent miscalculations and open channels to reduce the risks of conflict," Feltman said the international community was committed to finding a peaceful solution.

Feltman, the UN's under-secretary general for political affairs, also stressed the importance of full implementation of all relevant Security Council resolutions.

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