Sung Kim's visit to Seoul comes amid declining expectations for a quick resumption of talks and new tensions over ongoing U.S.-South Korean military exercises.
North Korea has ignored offers from the new Biden administration to resume negotiations between the two countries.
The weapons included the North's biggest-yet ICBM, which was mounted on an 11-axel launch vehicle that was also seen for the first time, and a presumptive new solid-fuel weapon designed to be fired from submarines.
US ambassador tells UN security council it must ‘act accordingly’ if the regime does not turn away from hostility and threats.
The White House is clarifying comments made by President Donald Trump during a news conference in France.
Kim said the "newly developed" system was a "great weapon," and expressed "high appreciation" for the scientists who had designed and built it, the country's official Korean Central News Agency said.
Defence officials in Seoul said Pyongyang fired what appeared to be two short-range ballistic missiles Friday, that flew some 230 kilometres (140 miles) before splashing down in the sea between the Korean peninsula and Japan.
In a historic moment, Trump walked across the concrete blocks dividing North and South Korean territory in the Demilitarized Zone that divides the peninsula.
Kim Hyok Chol, who laid the groundwork for the Hanoi meeting and accompanied Kim on his private train, was executed by firing squad for ‘betraying the supreme leader’ after he was turned by the US.
The Center for Strategic and International Studies said, that the satellite imagery of the Yongbyon nuclear site on April 12 showed five railcars near its uranium enrichment facility and radiochemistry laboratory.
Speaking before an Oval Office meeting with South Korean President, Moon Jae-in on Thursday, Trump also opened the door to a series of smaller deals with North Korea.
Trump and Kim are due to meet for one-on-one talks, then dinner, in the Vietnamese capital Hanoi, followed by more talks Thursday.
Following a historic first meeting in Singapore in June that produced a vaguely worded statement about Kim's nuclear arsenal, analysts say the second summit in Vietnam's capital Hanoi must this time put substance ahead of bonhomie.
An impersonator of North Korea's leader Kim Jong-un on Monday said Vietnamese authorities were deporting him from the country, just 24 hours before Pyongyang's leader was expected to arrive here ahead of his summit with US President Donald Trump.
The pair appeared with black-clad security guards at Hanoi's Metropole hotel and Opera House earlier in the day, where they were swarmed by press.
According to the UN estimates, 10.3 million people - almost half of North Korea's population - were in need of food due to a sharp drop in crop production.
The US State Department said that special US envoy for North Korea Stephen Biegun will meet again with Pyongyang officials ahead of the Trump-Kim talks
North Korean leader Kim Jong Un committed to denuclearization after meeting with Trump last year. A second Trump-Kim meeting is expected in February.
India's Prime Minister Narendra Modi addresses the 76th Session of the U.N. General Assembly at United Nations headquarters in New York.Photo by AP/PTI
Prime Minister Narendra Modi addresses the 76th session of the United Nations General Assembly in New York.PTI Photo
India's Prime Minister Narendra Modi addresses the 76th Session of the U.N. General Assembly at United Nations headquarters in New York.Eduardo Munoz /Pool Photo via AP
Paramilitary jawans conduct a route march for Bhabanipur Assembly by-election, in Kolkata.PTI Photo
Punjab Chief Minister Charanjit Singh Channi meet Governor of Punjab Banwarilal Purohit ahead of the oath taking ceremony for the Punjab Cabinet expansion, in ChandigarhPTI Photo
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