Seoul/Washington: US President Donald Trump said on Sunday a US team had arrived in North Korea to prepare for a proposed summit between him and North Korean leader Kim Jong Un, which Trump pulled out of last week before reconsidering.

Earlier, the US State Department said US and North Korean officials had met at Panmunjom, a village in the Demilitarized Zone (DMZ) that runs along the heavily armed border between North and South Korea.

‘Our United States team has arrived in North Korea to make arrangements for the Summit between Kim Jong Un and myself,’ Trump wrote on Twitter, in Washington’s first confirmation that US officials had entered North Korea for the talks.

‘I truly believe North Korea has brilliant potential and will be a great economic and financial Nation one day. Kim Jong Un agrees with me on this. It will happen!’ Trump added.

In addition to those talks, White House spokeswoman Sarah Sanders said a ‘pre-advance team’ left for Singapore - where the summit has been expected to take place - on Sunday morning to work on logistics.

Earlier on Sunday, South Korean President Moon Jae-in said he and North Korea’s Kim had agreed during a surprise meeting on Saturday that the North Korea-US summit must be held.

The weekend talks were the latest twist in a week of diplomatic ups and downs over the prospects for an unprecedented US-North Korea summit, and the strongest sign yet that the two Koreas’ leaders are trying to keep the meeting on track.

North Korea has faced years of economic sanctions over its nuclear and missile programs since it conducted its first nuclear test in 2006.

The United States has struggled to slow the isolated country’s weapons programs, which have become a security priority for Washington given Pyongyang’s promise to develop a nuclear-tipped missile capable of hitting the US mainland.

A US official told Reuters that Sung Kim, the former US ambassador to South Korea, would lead an American delegation to meet North Korean officials at the border. Pentagon official Randall Schriver was part of the US team, the official said.

The Washington Post first reported that the team, which also included Allison Hooker, the Korea expert on the White House National Security Council, met with Choe Son Hui, the North Korean vice foreign minister.

The Post said the talks at the border would continue on Monday and Tuesday at Tongilgak, the North’s building in Panmunjom, where the truce suspending the 1950-53 Korean War was signed.

In their meeting on Saturday, Kim reaffirmed his commitment to ‘complete’ denuclearization of the Korean Peninsula and to a planned summit with Trump, Moon told reporters in Seoul.

‘Chairman Kim and I have agreed that the June 12 summit should be held successfully, and that our quest for the Korean Peninsula’s denuclearization and a perpetual peace regime should not be halted,’ Moon said.

Moon acknowledged Pyongyang and Washington may have differing expectations of what denuclearization means and he urged both sides to hold working-level talks to resolve their differences.

The United States has demanded the ‘complete, verifiable, and irreversible’ dismantlement of North Korea’s nuclear weapons program. Pyongyang has rejected unilateral disarmament and has always couched its language in terms of denuclearization of the Korean Peninsula.

In previous, failed talks, North Korea said it could consider giving up its arsenal if Washington removed its troops from South Korea and withdrew its so-called nuclear umbrella of deterrence from South Korea and Japan.

North Korea has tested dozens of missiles of various types in the past two years, including one launch of its largest-ever intercontinental ballistic missile, which is theoretically capable of hitting anywhere in the United States, on Nov. 29.