The other is South Korean national security adviser Chung Eui-yong, who extended the invitation from Kim to Trump during a visit to Washington this week.
US allies in the region have given a cautious welcome to the development while vowing to keep up intense diplomatic and economic pressure on North Korea.
North Korean leader Kim Jong Un watches a basketball game with Dennis Rodman at Pyongyang Indoor Stadium in this undated photo released in January 2014. America's top North Korea diplomat Joseph Yun announced his surprise retirement earlier this month.
The summit announcement triggered a rise in global stock markets while world leaders voiced hope the meeting would deflate tensions that had been building dramatically in recent months.
Beijing gave a cautious welcome to news of Trump's plans to meet with Kim.
Trump says he will meet Kim Jong Un, steel tariff order signed, and it's jobs day.
That pressure would not abate as the US heads toward the historic talks, the White House said.
But is that a good place for the U.S.to be?
It's not clear. It could be that years of sanctions designed force it to talk are working.
Calling the planned US-North Korea talks a "step forward", Geng urged the two sides to build mutual trust through dialogue.
Hours before the news broke, Tillerson had said direct talks between the US and North Korea were still in the distant future. But he reiterated that sanctions are a means, not the end - for China, political resolution is the goal.
As has been repeatedly noted by the MSM, this face-to-face meeting would be a first for a sitting U.S. president.
Or it could think now is its change to finally be recognised as a serious nuclear state.
It is a gambit fraught with risk for Trump.
They then flew to the US with a message from Mr Kim - he wanted to meet Mr Trump and was prepared to give up his nuclear weapons.
Mr Kim said his country is "committed to denuclearisation" - for now this means the country will halt all nuclear and missile tests.
Trump tweeted today: "Kim Jong Un talked about denuclearisation with the South Korean representatives, not just a freeze". "The 'Korean risk' factor in Japanese equities will somewhat be reduced, pushing up prices", said Soichiro Monji of Daiwa SB Investments Ltd.
South Korea's Moon was ebullient.
"He'll do what is easy, he won't read a one-sheet on North Korea, he won't figure out how the United States has been fooled the past four presidents have been fooled, since 1994, or the past three presidents", Scarborough said. The most senior US military official, General Joseph Dunford, went so far as to say military action against North Korea would be "catastrophic". No American president has ever met with a North Korean leader while in office. Reports indicate North Korean exports were down 30% last year, 35% with their biggest trading partner, China.
"They want recognition as a nuclear weapon state, Kim Jong-un wants that recognition as the leader of a nuclear weapon state".
"President Trump has made his reputation on making deals", the official said in a briefing with reporters. "You're on the way to a historical meeting no U.S. president has ever done", Rodman said, also asking Trump to send his regards to Kim and his family, according to the Associated Press.
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