Singapore: North Korea and the United States traded blows over implementing a disarmament deal adopted at a landmark summit in June, as Washington called for maintaining sanctions pressure against the North which in turn said it was alarmed at US intentions.
The discord was the latest reminder of the difficulties that have long impaired efforts to negotiate an end to North Korea's nuclear and missile programmes, despite the June commitment made in Singapore by the leaders of the North and the United States.
"The DPRK stands firm in its determination and commitment for implementing the DPRK-US Joint Statement in a responsible and good-faith manner," North Korea's Foreign Minister Ri Yong Ho told a regional forum held in Singapore on Saturday.
DPRK refers to his country's official name, the Democratic People's Republic of Korea.
"What is alarming however is the insistent moves manifested within the US to go back to the old, far from its leader's intention," Ri said.
Ri made the statement after US Secretary of State Mike Pompeo had left the conference for Indonesia, a State Department spokeswoman said.
At the summit on June 12, US President Donald Trump and North Korean leader Kim Jong Un, who is seeking relief from tough sanctions, committed to work towards denuclearisation, but Pyongyang has offered no details on how it might go about this.
Pompeo pressed Southeast Asian nations in Singapore this week to maintain sanctions on North Korea but said he was optimistic that the deal to end the North's nuclear programme would work out.
"We have initiated goodwill measures of, inter alia, a moratorium on nuclear tests and rocket launch tests and dismantling of nuclear test ground," Ri said in a statement delivered to the Association of Southeast Asian Nations (ASEAN) forum.
"However, the United States, instead of responding to these measures, is raising its voice louder for maintaining the sanctions against the DPRK and showing the attitude to retreat even from declaring the end of the war, a very basic and primary step for providing peace on the Korean peninsula."
Pompeo suggested on Friday that continued work on weapons programmes by North Korea was inconsistent with Kim's commitment to denuclearise.
On Saturday, he stressed diplomatic and economic sanctions on the North must be maintained in order to achieve a complete end to the nuclear programme, carried out in defiance of U.N. Security resolutions.
He also said Washington took very seriously any relaxation of UN sanctions, calling out Russia for possibly violating a UN resolution by issuing work visas to North Korean workers.
"I want to remind every nation that has supported these resolutions that this is a serious issue and something that we will discuss with Moscow," he said.
"We expect the Russians and all countries to abide by the UN Security Council resolutions and enforce sanctions on North Korea."
Russia has denied a report by the Wall Street Journal that said Moscow was allowing thousands of fresh North Korean labourers into the country and granting them work permits in a potential breach of UN sanctions.
Russia's ambassador to North Korea also denied Moscow was flouting UN restrictions on oil supplies to North Korea.
Pompeo attended meetings of the foreign ministers of ASEAN as well as China, Russia, Japan and South Korea.
Ri attended one of a series of conferences.
At a group photo session, Pompeo walked up to Ri and shook hands and exchanged words and smiles.
He told Ri: "We should talk again soon," according to the State Department.
"I agree, there are many productive conversations to be had," Ri replied, according to the State Department.
US Ambassador Sung Kim handed Ri a letter from Trump for North Korean leader Kim in Singapore, the State Department said.
Pompeo, who has been leading the US negotiations to get the North to abandon its nuclear programme, had primarily engaged with Kim Yong Chol, a top North Korean party official and former spy agency chief, and not Ri.
Following his trip to Pyongyang in July, the North accused Pompeo of "gangster-like" diplomacy, casting doubts about the future of the discussions, but Trump later hailed progress after receiving a note from Kim.
Sung Kim, who has long been a key negotiator on the nuclear issue, said earlier he had no plans to meet the North Koreans in Singapore.
On Monday, a senior US official said US spy satellites had detected renewed activity at the North Korean factory that produced the country’s first intercontinental ballistic missiles capable of reaching the United States.
According to a confidential UN report seen by Reuters on Friday, North Korea has not stopped its nuclear and missile programmes and continued to defy Security Council resolutions through increased ship-to-ship transfers of petroleum products as well as coal transfers conducted at sea.
On Saturday, Pompeo was more upbeat about making progress on the denuclearisation agreement, saying: "We've been working since then to develop the process by which that would be achieved.