No North Korean leader has stepped foot in the South since the end of the Korean War in 1953.
In 1994, North Korea and the United States, under President Bill Clinton, sign an "agreed framework" with the goal of freezing and eventually discontinuing Pyongyang's nuclear program.
When Trump was asked whether he believed North Korea is prepared to give up its nuclear weapons, he replied, "They seem to be acting positively, but we're going to see".
The Key Resolve and Foal Eagle exercises - which usually begin in late Feburary or early March - were postponed as part of Seoul's efforts to draw the North to attend the Winter Games in the South.
Trump's recently announced import tariffs on steel and aluminum could give the U.S. leverage to hurry renegotiation of the North American Free Trade Agreement on better terms.
Have we been here before?
The developments may signal a desire by Kim to be seen more seriously and less as a maverick leader of a rogue regime.
The rogue state wants to loosen these sanctions.
The Trump administration has also emphasized a willingness to use military force, if needed, to eliminate the nuclear threat.
"Our posture toward the regime will not change until we see credible moves toward denuclearization", the official said.
Kim's apparent offer stunned many regional security experts and analysts in Washington.
With the talks in abeyance in 2006, the North steps up its missile testing and accuses the United States of being a nuclear menace, drawing a warning from Bush.
As far as reconciliation between the two Koreas is concerned, complete unification may be utopia.
"Nothing has been settled right now", President Moon said.
"No one I know had expected this", said Kim Byoung-joo, an affiliate professor of foreign studies at Hankuk University.
In this present climate, the optimists' version of the story would make for an all-too-happy ending to what has seemed like an endless saga, and an endless menace to the international order. Reports say that North Korea wants to also talk to the U.S. - which of course meant a weird tweet from Donald Trump came Tuesday as well.
In contrast, Sen. James Inhofe, a Republican from Oklahoma and member of the Committee on Armed Services, indicated that he is more optimistic about North Korea's recent gesture, noting that Kim Jong-un is coming out of years of "a policy of appeasement from Obama administration".
Fear of U.S. disengagement under Trump does appear to have helped revive some long-stalled initiatives to consolidate European military capabilities and procurement. South Korea was a big investor in the same area back in the late 1990s and tourism actually flourished for about a decade.
In a commentary, the paper said that Pyongyang's possession of a nuclear arsenal is justified. "Additional missile launches are a near certainty, and further nuclear tests are possible".
And what might the North demand in any talks?
"I don't share your optimism", Ashley said.
Trump had appeared to hint at a possible breakthrough Saturday.
"Do you have any measures for that situation?" he asked the president, who turned the question around on Hong. It also promised to suspend nuclear and missiles tests during such future talks, Chung said.
He said Kim had said denuclearisation could be discussed in negotiations between North Korea and the United States.
It fell apart after the US accused the isolated state of covertly restarting its weapons programme and aid delays angered Pyongyang, which eventually stormed out.
Other voices in the White House, including national security adviser H.R. McMaster, have spoken openly about the need to consider a pre-emptive military strike against North Korea, should it threaten the US or continue to develop its nuclear weapons and missile capabilities. North Korea has denied the accusation.