The current whirlwind of diplomacy and negotiations will not end with "a honest and complete disarmament" but with "a reduced North Korean nuclear threat", said Thae Yong-ho, who fled his post as the North's deputy ambassador to Britain in August 2016.
Secretary of State Mike Pompeo on Friday extended America's potential economic assistance to North Korea, under the assumption that they get rid of their nuclear weapons.
Moon has been upstaged by separate summits between Kim and Chinese President Xi Jinping, which were seen as strengthening the positions of both countries ahead of the Kim-Trump talks.
Pompeo said the complete denuclearisation of the Korean peninsula would require a "robust verification" program by the United States and other countries.
Seoul proposed to hold the high-level dialogue on Monday, but Pyongyang made a counterproposal to hold such talks on Wednesday, which was agreed upon by South Korea Tuesday. He says a deal will need to include inspections to confirm Pyongyang is following through.
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And Pompeo said the United States would remain on board to help develop the North's economy, which has been devastated by its own mismanagement and crippling global sanctions.
Kang says there must be "airtight" coordination between South Korea and the USA ahead of President Donald Trump's upcoming meeting with Kim.
The hotel also hosts the annual Shangri-La Dialogue, widely seen as Asia's most important security forum, bringing together defense ministers and high-level government officials from across the region.
"It was confirmed that Kim Jong-un didn't attend last week's contest", the source pointed out. "It can never happen", Thae said.
In the expert's opinion, Trump's statement "won't produce a negative effect on the negotiating process with North Korea". Moon has so far stayed firm on sanctions, and he offered vocal support to Trump's pressure campaign previous year during the North's weapons tests.
Speculation has emerged that Trump may visit Japan to brief Abe about the outcome of his meeting with Kim in Singapore.
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Warned by Obama days after his election that the threat posed by Pyongyang could define his presidency, Trump answered Kim's threats with bellicose warnings of his own and rallied an worldwide pressure campaign against North Korea.
"We're not talking about sanctions relief at this point", Kang said.
As of a year ago the UN Security Council sanctions included measures on sectors such as coal, fish, textiles and overseas workers.
Moon doesn't have the power to resolve North Korea's weapons programs on his own.
But it had a long history of making overtures that ultimately came to nothing, he warned.
But unlike mainland China, which successfully opened its economy to foreign investment, North Korea remains a complex business environment with unclear tax and investment laws.
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"North Korea's diplomacy has always been a repeat of hardline and appeasement", Thae said.