Chung, who had met with Kim in Pyongyang earlier last week, said the North Korean leader had agreed to a temporary halt In missile and nuclear tests leading up to the meeting with Trump.
The South Korean officials who took Kim's invitation to Washington are visiting China and Japan this week to update their neighbors on the talks.
Trump would become the first sitting USA president to meet with a leader of the reclusive country.
Koh Yu-hwan, who teaches North Korean studies at Dongguk University in Seoul, said the regime has long sought a peace treaty to end the more than 60-year-old cease-fire between the two sides and help guarantee its safety.
Central Intelligence Agency director Mike Pompeo says the US will not make concessions to North Korea before President Trump holds talks with the reclusive country's leader, Kim Jong Un. So how was this remarkable coup achieved? -South Korean military exercises during that time.
South Korea's minister for trade, Kim Hyun-chong, who has visited the United States twice in recent weeks to seek ways to minimize the damage to South Korean steelmakers, will depart for the USA again on Tuesday, a ministry spokeswoman said. CIA, he said has an important role to play in this and keep the president well informed. He seemed to be signaling Seoul, Washington and Pyongyang that Beijing's contribution to peacemaking had thus far been indispensable and would continue to be essential going forward. "The nature of Kim Jong-un himself, he's still a very young leader, but clearly in charge of his country". This has meshed neatly with North Korea's short-term objective; to extricate itself from the stranglehold of China, which (also fearful of a USA strike) had begun to impose ever tighter sanctions. The future of the US-South Korea alliance may well be in the balance.
What was not predictable and has always intrigued me is why several American soldiers defected to North Korea after the war.
Hours after the announcement, news website Politico reported a summit could be in jeopardy after the Trump administration followed the vague announcement before announcing detailed plans that include preconditions North Korea would likely never agree to. It was headed by Chung Eui-yong. Photos of her with Moon were front-page news in the North.
South Korea's National Security Office chief, Chung Eui-yong, who led the delegation to Pyongyang, will head to Russian Federation on Tuesday, while spy agency chief Suh Hoon met Japan's foreign minister in Tokyo, where he is to speak with Prime Minister Shinzo Abe on Tuesday. North Korea is not the centerpiece of our Asia-Pacific strategy. His NIS deputy Kim Sang-gyun also attended the dinner as did Chon Hae-song, vice minister for Unification.
China was the host and convener of the Six-Party Talks, a 2003-2007 process that saw North Korean representatives sit down with delegates from the United States and four other countries to discuss ending the North's nuclear program in exchange for incentives. White House officials initially waffled on the president's intentions.
US student Otto Warmbier died last summer shortly after his release from a 17-month detention.
A potential answer is provided by the visit of Ivanka Trump to the Olympics closing ceremony.
North Korea is already a nuclear power, whether anyone likes that or not.
Mr Trump's main goal is to look good - to get a "win" - and Mr Kim's advisers will have told him to let Mr Trump win something. Our most vital interest is ensuring we maintain our principle advantage over China and Russian Federation: that network of close partners.