Kim got to the bargaining table in part by vowing not to resume nuclear tests, and he could use peace talks to legitimize his regime and get global sanctions relaxed.
Although Kim promised Trump in June to achieve "complete" denuclearisation of the Korean Peninsula in return for security guarantees from Washington, scepticism has been lingering about North Korea's intention to take concrete steps toward it.
Trump tweeted his thanks in response to the relayed statement of confidence.
"The optics of a Politburo member standing next to evidence that North Korea has or is making progress in their nuclear program during the ongoing de-nuclear negotiations with the United States, to me it seems that China would not want that picture", Daniels said.
In Pyongyang, there are reports that some of the anti-American propaganda has been taken down around the city. If he shows a new ICBM during Sunday's parade, it would likely further complicate relations with the United States amid a stalemate over nuclear diplomacy.
North Korea feels it has already shown goodwill by not testing any missiles this year. They are believed to be those of American soldiers who died in the Korean War.
US intelligence officials are even more wary about Pyongyang's repeated commitments to denuclearize.
From a distance, the mosaic-like screen of shifting colors nearly appears to be electronic, lighting up a North Korean stadium like a huge TV.
He is reportedly disappointed at the lack of progress on de-nuclearisation since the Singapore summit between North Korea's Kim Jong-un and US President Trump.
While the April declaration's language on denuclearization was considered weak, the document made inroads on a raft of other points of friction between the two Koreas.
Observers say the military parade could cast doubt on North Korea's sincerity about denuclearising and pausing its missiles programme. They say the North has often sought to gain economic aid and then failed to keep its promises.More news: British Airways apologizes after 380k customers hit by cyber attack
Either way, soon after the Sunday celebrations end, Kim will once again meet in Pyongyang with South Korean President Moon Jae-in to discuss ways to break the impasse over his nuclear weapons.
On Aug. 15, 1949, Kim held a military parade at the same plaza to mark the anniversary of the 1945 liberation of the Korean Peninsula from Japanese occupation.
The events, especially the photogenic Mass Games, offer North Korea a chance to raise foreign currency from thousands of global visitors pouring into the capital, at a time when tourism remains one of the few remaining reliable sources of income amid United Nations sanctions targeting 90 percent of its $3 billion annual exports.
Despite speculation that Chinese President Xi Jinping would attend, Beijing instead sent its third-highest party official.
He said, while China has listened to North Korea's concerns, the country has reduced trade with its neighbor and placed pressure on it.
Some analysts suggested Kim was flattering Trump in hopes of dividing the president from advisers who have advocated a tougher USA stand.
"While these talks are military-to-military and scheduled to be confined to the repatriation issue, having some progress on any front would be welcome", the USA official said, speaking on the condition of anonymity. It was the first chance for outsiders to hear his voice, something that wasn't repeated until 2000 when his conversation with visiting South Korean President Kim Dae-jung was broadcast.
Stephen Biegun, newly-appointed USA envoy for the North, said last month Kim had promised "final, fully verified denuclearization" at the Singapore summit.
Kim had a one-hour meeting with Matvienko, the speaker of the upper house of the Russian parliament.
The newly announced summit between the Korean leaders would come just before the yearly gathering of world leaders at the United Nations in NY.
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