A senior North Korean official made a rare visit to the United States on Wednesday for talks about a possible summit between the leaders of the two countries but the sides appeared far apart on the central issue of Pyongyang's nuclear weapons.
Kim Yong-chol, a close aide of North Korean leader Kim Jong Un and vice chairman of the ruling Workers' Party's Central Committee, arrived at New York's John F Kennedy airport on a flight from Beijing. He was later seen entering a hotel in midtown Manhattan.
Kim Yong-chol was due to meet US Secretary of State Mike Pompeo on Wednesday and Thursday to discuss whether to go ahead with an unprecedented meeting between US President Donald Trump and North Korean leader Mr Kim.
The summit, originally planned for June 12 in Singapore, has been cast in doubt as the two countries – which have technically been at war since the 1950s – test each other's diplomatic mettle.
As US and North Korean officials prepared for their first encounter in New York, Mr Pompeo repeated the Trump administration's demands.
"Looking forward to meeting with Kim Yong-chol in New York to discuss @Potus potential summit with Chairman Kim. We are committed to the complete, verifiable, and irreversible denuclearisation of the Korean Peninsula @StateDept," Mr Pompeo said in a Twitter post.
Mr Trump last week called off the summit after North Korea expressed anger at comments by senior US officials. But Mr Trump later said he was reconsidering his position and US, North Korean and South Korean officials have gone ahead with summit preparations.
The White House said that negotiations at the demilitarised zone along the border between North and South Korea for the summit were going well and that it expects the historic meeting to take place on June 12.
Separately on Wednesday at Pearl Harbor in Hawaii, Admiral Harry Harris, the outgoing head of US Pacific Command who is Mr Trump's choice to be the ambassador to South Korea, said North Korea remained the United States' most imminent threat. "And a nuclear-capable North Korea with missiles that can reach the United States is unacceptable," Admiral Harris said.
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A US official said negotiations about the summit's agenda have so far been slow going, and the two fundamental issues, the definition of North Korean denuclearisation and whether both sides would take actions at the same time or separately, remained unsettled.
Mr Trump has sworn not to allow North Korea to develop nuclear missiles that could hit the US and wants North Korea to "denuclearise", or get rid of its nuclear arms.
But the leadership in Pyongyang is believed to regard nuclear weapons as crucial to its survival and has rejected unilaterally disarming.
The US official said the US position remained that Pyongyang must agree to complete denuclearisation before it can receive any financial assistance, such as relaxation of some economic sanctions, new food or other aid, or new investment, and that the degree of assistance would depend on the pace and extent of Pyongyang’s actions.
North Korea’s position going into the meetings with Mr Pompeo in New York, meanwhile, was that a pledge of denuclearisation alone should open the way to economic relief, said the official, who is familiar with the talks and spoke on condition of anonymity.
South Korea’s Yonhap news agency quoted Seoul’s Unification Minister Cho Myoung-gyon as saying in a speech on Wednesday that the differences between North Korea and the US on the denuclearisation issue remained “quite significant” and it would not be easy to narrow the gap.
However, Mr Cho added that the engagement of the leaders of the two countries meant “chances are high that common ground can be found."
Kim Yong-chol is the most senior North Korean official to meet top officials for talks in the US since Jo Myong Rok, a vice marshal, met former president Bill Clinton at the White House in 2000.
A former military spy chief, he has played a central role in the thaw in relations over the past six months between North Korea and South Korea, as well as the US.
During his tenure as a senior intelligence official, Mr Kim was accused by South Korea of masterminding deadly attacks on a South Korean navy ship and an island in 2010. He was linked by US intelligence to a cyberattack on Sony Pictures in 2014.
North Korea denied any involvement in the attack on the ship and on Sony Pictures.
North Korea defends its nuclear and missile programmes as a deterrent against what it regards as US ambitions to overthrow its leadership and unite the Korean Peninsula. The US stations 28,500 troops in South Korea, a legacy of the 1950-53 Korean War.