Mr. Feltman will be meeting North Korea's Foreign Minister and Vice President, but it is still not clear whether he will hold talks with North Korea's dictator, Kim Jong Un.
United Nations spokesman Stephane Dujarric said Monday that Feltman will discuss "issues of mutual interest and concern" with Foreign Minister Ri Yong Ho and Vice Minister Pak Myong Guk during his visit, which ends on Friday.
North Korea's vice foreign minister met visiting United Nations political affairs chief Jeffrey Feltman on Wednesday in the North Korean capital, Pyongyang, the North's state media said.
Feltman shook hands with a North Korean foreign ministry official after flying into Pyongyang from Beijing on the North's Air Koryo.
In a new editorial today, North Korean state media blasted the joint US-South Korean drills as going "beyond the danger line" adding the two allies were like "a group of tiger moths flying into fire only to perish in it".
Trump announced on November 20 that the United States was returning North Korea to the list of state sponsors of terrorism and promised to intensify a campaign of "maximum pressure" and sanctions as part of a rolling effort to compel Kim's government to negotiate over its nuclear program.
The spokesman noted that Guterres has repeatedly said "his good offices are always available if the parties want".
It may take a while to find out exactly what is being discussed during Jeffrey Feltman's visit this week.
U.N. Secretary-General Antonio Guterres has, on various occasions, voiced his interest in serving as a mediator to resolve the North's nuclear issue.
Dujarric said Pyongyang issued an invitation for Feltman to visit back in September, during the annual gathering of world leaders at the U.N. General Assembly.