South Korean President Moon Jae-in arrived in Washington on Monday for talks with U.S. President Donald Trump about strategies for Trump's upcoming high-stakes summit with North Korean leader Kim Jong-un.

Moon is scheduled to hold talks with Trump on Tuesday, starting with a 30-minute private meeting where the leaders will be accompanied by no one else besides only their interpreters, an official from Seoul's presidential office Cheong Wa Dae said.

"The fact that the two leaders will hold talks with no other attendants is important. It will likely be a chance for them to share their inner-most thoughts," the official said earlier, while speaking on condition of anonymity.

Moon, who held historic summit talks with Kim on April 27, is expected to share with Trump his experiences of dealing with the North's leader so as to help Trump prepare for his own talks with Kim set for June 12 in Singapore.

"We expect the South Korea-U.S. summit to play a role as a bridge (between the U.S. and North Korea) that will lead to the success of the North Korea-U.S. summit as it comes three weeks before the North Korea-U.S. summit," said Nam Gwan-pyo, a deputy director of the presidential National Security Office.

The file photo, taken Nov. 7, 2017, shows South Korean President Moon Jae-in (R) and U.S. President Donald Trump shaking hands in a joint press conference following their bilateral summit in Seoul, South Korea. (Yonhap)

Moon has already held two telephone conversations with Trump since his summit with Kim.

His U.S. visit came as he seeks to provide a more detailed account of his encounter with the reclusive North Korean leader that Cheong Wa Dae officials said could not be delivered soundly over the phone.

"President Moon will likely tell President Trump what to expect and what not to expect from Kim," a Cheong Wa Dae official said earlier.

His trip also follows what appeared to be a change of heart in North Korea's denuclearization commitment.

In a joint declaration reached at the latest inter-Korean summit, Moon and Kim agreed to pursue complete denuclearization of the Korean Peninsula and also to halt their countries' hostile acts against each other and instead put their bilateral relationship back on the right track, which called for a resumption of dialogue, including the Red Cross talks.

Pyongyang, however, indefinitely suspended its high-level dialogue with the South scheduled for last week.

It cited an ongoing joint military exercise of the South and the U.S. as a reason, apparently throwing off many South Koreans who believed the old issue would no longer get in the way of the divided Koreas since Kim told Moon's top security adviser Chung Eui-yong in early March that he "understood" the need for the allies to resume their joint drills following a temporary suspension over the 2018 PyeongChang Winter Olympic Games held in South Korea.

The North has also threatened to reconsider holding its first-ever summit with the United States.

Still, keeping the upcoming summit alive is an apparent peace offer from Trump.

On Thursday, the U.S. president said Kim will be "very, very happy" if they reached a nuclear deal at their upcoming summit.

The remarks came in response to an earlier claim by the North that the U.S. may be seeking to denuclearize North Korea with no guarantee of benefits.

Trump said such a model will take place if he and Kim cannot reach a nuclear deal. (Yonhap)

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