U.S. president Donald Trump called-off the much-anticipated summit between him and North Korean leader Kim Jong-un on Thursday citing "anger and open hostility".
"I do hope the Trump administration has learned a little about diplomatic trade craft and the need to send lower level delegations to test the assumptions of whether North Korea's prepared to do the things we hope they were doing", Christopher Hill, formerly USA ambassador to South Korea under President George W. Bush, told CNBC's "Squawk Box" on Friday.
Kim speculated that Trump may have "lacked the will for the summit or he might not have felt confident", but that the North has "exerted honest efforts" for talks that "would mark a meaningful starting point for peace and security in the region and the world".
Moon will not be able to act on numerous agreements he made with Kim at their summit unless meaningful progress is made on the nuclear issue, which requires cooperation by the United States, said Cheon Seong-whun, a former secretary to the president for security strategy. Although the administration secured the release of three American detainees, North Korea is no closer to ending its nuclear program.
The details of the now scrapped talks were unclear.
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"We're going to see what happens. They very much want to do it, we'd like to do it". "It was a very nice statement they put out".
Separately, US Defence Secretary James Mattis echoed Mr Trump's comments.
In his statement to the North, Trump said: "If you change your mind having to do with this most important summit, please do not hesitate to call me or write".
It was personally addressed to Mr Kim. North Korea's vice foreign minister expressed sadness the meeting had been called off, but praised Trump for making a bold decision to hold the summit and said the North was open to meeting at any time. "You talk about your nuclear capabilities, but ours are so massive and powerful that I pray to God they will never have to be used", Trump wrote.
"The United States might have been discontent with the difference between what South Koreans told them about denuclearisation and what they actually found out when they met the North Koreans", said Koh Yu-hwan, a professor in North Korea studies at Dongguk University in Seoul.
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But, it was exposed as being ineffective against low-flying aircraft, a fact that was likely exploited by Israeli pilots. Pacific Command's Theater Security Package program, preparing to launch without their Luneberg reflectors.
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External Affairs Minister Sushma Swaraj said she was in constant touch with Indian authorities in Canada regarding the blast. Police said they were there as a part of a "multi-unit" response, but would not say if there is any threat to public safety.
But with Kim seen to be open to dialogue while Trump appears to be rejecting his overtures, China may quietly permit trade to resume, allowing North Korea to continue to build its economy.
There were a series of "broken promises" from Pyongyang, the official told reporters, including when the White House sent the deputy chief of staff to Singapore to meet North Korean diplomats ahead of the summit.
The biggest risk is that Pyongyang's recently escalated rhetoric - including a statement referring to Vice President Mike Pence as a "political dummy" - will make Trump return to his own highly charged language, like last year's threat's of military "fire and fury" and taunts of Kim as "little rocket man".
Ms Choe, who has been involved in several diplomatic interactions with the U.S. over the past decade, said the North would not "beg" for dialogue and warned of a "nuclear showdown" if diplomacy failed.
References to Libya have angered North Korea.
Former Libyan leader Muammar Gaddafi gave up his nuclear arsenal in negotiations with the West, but he was later overthrown and killed after a North Atlantic Treaty Organisation air intervention that supported rebels on the ground.
Moon had been credited with creating conditions for peace by bringing the old foes on a diplomatic path, after North Korea's relentless pursuit of a nuclear-armed missile capable of hitting the United States raised fears of a fresh war on the Korean peninsula. It is insistent it will not engage in any peace process that jeopardises its leadership or its survival as a state.
"I think President Trump did exactly the right thing in canceling the meeting", Senator Mitch McConnell of Kentucky, the Republican leader, said in a Thursday interview on Fox News.
However, Trump's decision hasn't come as a complete shock for those who have been following-up the constant back-and-forth from both sides in the run-up to the June meeting.
It was South Korean officials who first informed the United States earlier this year that Mr Kim was prepared to discuss potential nuclear disarmament. Moon says the "fate and the future of the Korean Peninsula hinge" on the meeting in Singapore.
China said the U.S. and North Korea should show patience, encouraging them to "show goodwill and meet each other halfway".