The world body, United Nations, is trying to leave up to its billing by making sure that the world does not have to fight anther war.

As tension between America and North Korea soars over North Korea’s missile programme, a senior United Nations official has been dispatched to North Korea on Tuesday in a move to calm things down.

Jeffrey Feltman's visit -- the first by a UN diplomat of his rank since 2010 -- comes less than a week after North Korea said it test-fired a new ballistic missile capable of reaching the United States.

Feltman arrived in a UN-flagged car at Beijing's international airport in the morning before North Korea's Air Koryo flight took off for Pyongyang in the early afternoon.

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His trip comes a day after the United States and South Korea launched their biggest-ever joint air exercise -- manoeuvres slammed by Pyongyang as an "all-out provocation".

The five-day Vigilant Ace drill involves 230 aircraft, including F-22 Raptor stealth jet fighters, and tens of thousands of troops, Seoul's air force said.

Feltman, the UN's undersecretary general for political affairs, arrived in China on Monday as Beijing is one of the few transit points to North Korea in the world.

Once in the North, Feltman will discuss "issues of mutual interest and concern" with officials, UN spokesman, Stephane Dujarric said, adding that was unable to say whether Feltman will meet with the reclusive state's leader Kim Jong-Un.

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