United Nations Under-Secretary-General for Political Affairs Jeffrey Feltman has set out on his four-day official visit to North Korea.
Feltman, who heads the UN's Department of Political Affairs, was officially invited by the North Korean leadership in early September for a "policy dialogue."
However, the DPRK only confirmed the invitation last week, merely a day after its latest missile test, which it claims can reach the entire continental US.
A UN spokesman quoted by the BBC, said that Feltman will hold meetings with a number of senior North Korean officials, where they will discuss "issues of mutual interest and concern."
The UN diplomat is expected to meet the country's Foreign Minister Ri Yong-ho, but not North Korea's enigmatic leader Kim Jong-un.
The UN's decision to dispatch Feltman, who is the highest-ranking UN official to visit the country for the past six years, reflects the organization's efforts to defuse the international crisis that may well lead to a nuclear war.
In September, UN Secretary-General Antonio Guterres offered to assume the role of a mediator in the crisis, calling upon world leaders to exercise restraint in order to avoid "nuclear peril."
"We must not sleepwalk our way into war," Guterres said during the annual summit of the UN General Assembly.
Feltman's profile, as a career American diplomat who worked some 26 years in the State Department before being offered his new position at the UN, also likely played a role in his visit, since the tension between the US and North Korea continues to escalate.
This Monday, the American and South Korean military launched their largest joint aerial drills, featuring over 200 combat planes and thousands of soldiers.
North Korea branded the five-day exercises as a "provocation".