In this photo provided by South Korea Presidential Blue House via Yonhap News Agency, North Korean leader Kim Jong Un, left, and South Korean President Moon Jae-in embrace each other after their meeting at the northern side of the Panmunjom in North Korea, Saturday, May 26, 2018. Kim and Moon have met for the second time in a month to discuss peace commitments they reached in their first summit and Kim's potential meeting with President Donald Trump. (South Korea Presidential Blue House/Yonhap via AP)

In this photo provided by South Korea Presidential Blue House via Yonhap News Agency, North Korean leader Kim Jong Un, left, and South Korean President Moon Jae-in embrace each other after their meeting at the northern side of the Panmunjom in North Korea, Saturday, May 26, 2018. Kim and Moon have met for the second time in a month to discuss peace commitments they reached in their first summit and Kim's potential meeting with President Donald Trump. (South Korea Presidential Blue House/Yonhap via AP)

SEOUL, South Korea (AP) — North Korean leader Kim Jong Un and South Korean President Moon Jae-in met Saturday for the second time in a month, exchanging a huge bear hug and broad smiles in a surprise summit at a border village to discuss Kim’s potential meeting with President Donald Trump and ways to follow through on the peace initiatives of the rivals’ earlier summit.

Following a whirlwind 24 hours that saw Trump cancel the highly anticipated June 12 meeting with Kim before saying it’s potentially back on, the Korean leaders took matters into their own hands.

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Their quickly arranged meeting Saturday appears to highlight a sense of urgency on both sides of the world’s most heavily armed border: Moon wants to secure a summit that he sees as the best way to ease animosity that had some fearing a war last year; Kim may see the sit-down with Trump as necessary to easing pressure from crushing sanctions and to winning security assurances in a region surrounded by enemies.

Kim, in a telling line from a dispatch issued by the North’s state-run news service on Sunday, “expressed his fixed will on the historic (North Korea)-U.S. summit talks.” The two Korean leaders agreed to “positively cooperate with each other as ever to improve (North Korea)-U.S. relations and establish (a) mechanism for permanent and durable peace.”

They agreed to have their top officials meet again June 1 and to set up separate talks between their top generals.

The meeting came hours after South Korea expressed relief over revived talks for a summit between Trump and Kim.

It remains unclear whether Kim will ever agree to fully abandon his nuclear arsenal in return, despite Moon’s insistence that Kim can be persuaded to abandon his nuclear facilities, materials and bombs in a verifiable and irreversible way in exchange for credible security and economic guarantees.

Moon, who brokered the summit between Washington and Pyongyang, likely used Saturday’s meeting to confirm Kim’s willingness to enter nuclear negotiations with Trump and clarify what steps Kim has in mind in the process of denuclearization, said Hong Min, a senior analyst at Seoul’s Korea Institute for National Unification.

“While Washington and Pyongyang have expressed their hopes for a summit through published statements, Moon has to step up as the mediator because the surest way to set the meeting in stone would be an official confirmation of intent between heads of states,” Hong said.

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South Korean presidential spokesman Yoon Young-chan said Moon will reveal details of his meeting with Kim on Sunday.

U.S. officials have talked about a comprehensive one-shot deal in which North Korea fully eliminates its nukes first and receives rewards later. But Kim, through two summits with Chinese President Xi Jinping in March and May, has called for a phased and synchronized process in which every action he takes is met with a reciprocal reward from the United States.

Koh Yu-hwan, a North Korea expert at Seoul’s Dongguk University and a policy adviser to Moon, said the South Korean president wants Kim to accept an alternative approach advocated by Seoul, in which the North’s comprehensive commitment and credible actions toward denuclearization are followed by a phased but compressed process of declaration, inspection and verifiable dismantling.

Before he canceled the summit, Trump this past week did not rule out an incremental approach that would provide incentives along the way to the North.

Trump tweeted earlier Saturday that a summit with Kim, if it does happen, will likely take place on June 12 in Singapore as originally planned.

Following an unusually provocative 2017 in which his engineers tested a purported thermonuclear warhead and three long-range missiles theoretically capable of striking mainland U.S. cities, Kim has engaged in a flurry of diplomatic activity in recent months. In addition to his summits with Moon and Xi, Kim also has had two meetings with U.S. Secretary of State Mike Pompeo.

It wasn’t immediately clear how the rival Koreas organized what appeared to be an emergency summit. Ahead of their first meeting last month, Kim and Moon established a hotline that they said would enable direct communication between the leaders and would be valuable to defuse crises, but it was unclear whether it was used to set up the latest meeting.

Photos released by South Korea’s presidential office showed Moon arriving at the North Korean side of the Panmunjom truce village and shaking hands with Kim’s sister, Kim Yo Jong, before sitting down with Kim for their summit.

Moon was accompanied by his spy chief, Suh Hoon, while Kim was joined by Kim Yong Chol, a former military intelligence chief who is now a vice chairman of the North Korean ruling party’s Central Committee tasked with inter-Korean relations.

The two leaders embraced as Moon departed.

Moon’s office said that during their two-hour meeting, the two leaders also discussed carrying out the peace commitments they agreed to at their first summit, held at the South Korean side of Panmunjom on April 27, but didn’t elaborate.

At their first meeting, Kim and Moon announced vague aspirations for a nuclear-free Korean Peninsula and permanent peace, which Seoul has tried to sell as a meaningful breakthrough to set up the summit with Trump.

But relations between the two Koreas chilled in recent weeks, with North Korea canceling a high-level meeting with Seoul over South Korea’s participation in regular military exercises with the United States and insisting that it will not return to talks unless its grievances are resolved.

South Korea was caught off guard by Trump’s abrupt cancellation of his summit with Kim, with the U.S. president citing hostility in recent North Korean comments. Moon said Trump’s decision left him “perplexed” and was “very regrettable.” He urged Washington and Pyongyang to resolve their differences through “more direct and closer dialogue between their leaders.”

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Associated Press writer Foster Klug contributed to this report.