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(CNN) — North Korea is willing to talk to the United States about giving up its nuclear weapons, South Korea said Tuesday, in a remarkable development that followed unprecedented meetings in Pyongyang.

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North Korean leader Kim Jong Un has also agreed to refrain from conducting nuclear and missile tests while engaging in dialogue with South Korea, Seoul’s national security chief Chung Eui-yong said after returning from talks with Kim.

Chung said Pyongyang expressed willingness to talk to the United States “in an open-ended dialogue to discuss the issue of denuclearization and to normalize relations with North Korea.”

North Korea clarified that it had no reason to retain nuclear weapons if “the military threat to North Korea is resolved” and the country’s security can be guaranteed, Chung said.

It’s a startling statement from a nation that only months ago declared it could wipe the United States off the face of the Earth.

“This is Kim Jong Un stepping on the peace offensive gas pedal,” Duyeon Kim, a senior research fellow at the Korean Peninsula Future Forum in Seoul, said.

The Trump administration has said it’s willing to negotiate with North Korea if it puts denuclearization on the table.

A win for Moon

The announcement represents a significant diplomatic accomplishment for South Korean President Moon Jae-in, who used the Winter Olympic Games to engineer a thaw in relations with the North that had previously seemed a distant prospect.

As part of the dialogue, the two Korean leaders would hold a summit next month, the first of its kind in more than a decade, Chung said.

The last inter-Korean summit was in 2007, when South Korean President Roh Moo-hyun met Kim’s father, late North Korean leader Kim Jong Il.

The April summit will be held at the Panmunjom Peace House on the South Korean side of the demilitarized zone that divides the two countries, Chung said.

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Pyongyang and Seoul will also open a communication hotline that will enable Kim and Moon to speak directly.

Moon sent Chung and four other top government officials to Pyongyang Monday, when they met with Kim and some of his top aides.

It’s believed to be the first time the young North Korean leader has ever met with any officials from South Korea since taking power in 2011.

‘Something to work with’

Pyongyang has long maintained its development of nuclear weapons is a response to what it calls the US “hostile policy” towards the Democratic People’s Republic of Korea, as the country is officially known.

Kim, the research fellow, said it was now up to negotiators to seize on the opportunity presented by the summit and potential talks with the US.

“Pyongyang’s intention to denuclearize and refrain from testing during talks simply reiterates its longstanding position in principle, (they) are conditional statements and dubious, but saying them publicly nevertheless give Washington and Seoul something to work with. That’s where good negotiations come in,” she said.

The US and South Korea had postponed joint military exercises, which Pyongyang views as hostile, during the Winter Olympics but the drills had been expected to resume after the Paralympics end later this month. It’s not clear whether Tuesday’s developments will alter that.

During his Tuesday meeting, Kim told the South Korean delegation he “understands” Seoul’s position on the drills.

“Our stance on the joint military drills is that it is hard to postpone the exercises again or suspend them and there is no justification for doing so. But Kim said that he understands the South’s stance,” an official in President Moon’s administration said.

(©2018 Cable News Network, Inc., a Time Warner Company. All rights reserved. By Joshua Berlinger and Jungeun Kim)

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