They said a third Trump-Kim summit without meaningful working-level talks beforehand would raise the risks of another embarrassing failure.
When former President Kim Dae-jung, who received the Nobel Peace Prize in 2000 for initiating and successfully implementing the "Sunshine Policy" toward the North, passed away in August 2009, Pyongyang sent six senior officials to attend Kim's funeral.
Here are some of the major events since Kim and Trump shook hands a year ago.
"I can't show you the letter obviously, but it was a very personal letter, very warm, very nice letter".
He added, "I think that something will happen that's going to be very positive". "And we really haven't seen that". "At the time, the conservative South Korean government had refused to send an official delegation, so the North interpreted Lee's trip as a courageous and honest reconciliatory move on her part".
Amid the stalemate, Washington and Pyongyang are again teetering on the edge of a period of hostility.
South Korea also played down the tests, with Moon calling them a protest against the failed Vietnam summit and a sign the North wanted to negotiate.
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Trump and Kim agreed in Singapore to work towards the complete denuclearisation of the Korean peninsula. US officials later acknowledged Washington and Pyongyang do not share a common understanding of the word "denuclearization".
In emails to a Japanese journalist obtained by North Korea's Chosun Ilbo newspaper in 2012, Kim suggested that the regime would collapse under his younger brother, who he said "resembles my grandfather", North Korean dictator and founder Kim Il-sung.
The diplomat gave North Korea an "F" grade regarding implementation of the sanctions fuel import cap.
But negotiations aimed at ending North Korea's nuclear and missile programs have stalled since their second summit in the Vietnamese capital, Hanoi, broke down in February. The US says North Korea needs to make verifiable progress towards giving up its nuclear weapons before any sanctions are eased, while North Korea says the US has done nothing to reward steps already taken.
In Singapore, Trump made a surprise announcement that the United States would suspend military drills with South Korea.
Not only have US officials given conflicting statements about whether they are open to a step-by-step denuclearization process, Trump at times openly disagrees with his top advisors over Korea policy.
Officials at South Korea's National Intelligence Service and the Unification Ministry, which oversees ties with North Korea, also said they could not confirm the report.
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In May, Kim oversaw the test launch of new, short-range missiles while giving a cold shoulder to projects planned with South Korea. "Who knows? It doesn't matter".
There was no mention of the letter in North Korean state media.
"But he's kept his word to me; that's very important", said Trump.
Though talks stalled, the first meeting between the two countries in Singapore was seen as an global diplomatic triumph as both sought to work towards the denuclearisation of the Korean peninsula.
On Tuesday, Trump said he received a lovely and warm letter from Kim and that he expects "something very positive will happen".
But in Washington, President Donald Trump, who has sought to negotiate North Korea's denuclearization with Kim Jong Un, suggested he would not have permitted the Central Intelligence Agency to recruit Kim Jong Nam.
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