Kim Dong-ho, a 38-year-old employee at a blockchain company, said it wasn't right to isolate North Korea again when it was making efforts to join the worldwide community.
In a statement published on Friday by state-run Korean Central News Agency, Vice Foreign Minister Kim Kye-gwan said North Korea is "intent to sit with the U.S. side to solve [the] problem regardless of way at any time". We will soon see where it will lead, hopefully to long and enduring prosperity and peace. But there is also no question that his abrupt decisions-first raising expectations, by so readily and eagerly embracing the prospect of a summit, and then dashing them, with his unexpected withdrawal-do not fit very well into the ponderous, incremental world of worldwide diplomacy.
Earlier on Friday, Trump welcomed the statement as "warm and productive". "We'll see what happens", he said.
Mr Trump said he had been "very much looking forward" to meeting Mr Kim. Indeed, the North seems to have been as surprised as the South that Mr Trump backed out.
"Denuclearisation of the Korean peninsula and the establishment of permanent peace are historic tasks that can neither be abandoned nor delayed", Mr Moon said during an emergency meeting with his top security officials at the presidential office, the Blue House.
At the Pentagon, U.S. Defense Secretary Jim Mattis said Friday that "the diplomats are still at work on the summit" but declined to say whether he thought the event would take place on June 12.
The reversal followed a warning from North Korean vice minister of foreign affairs Choe Son Hui overnight Wednesday that Pyongyang could "make the USA taste an appalling tragedy it has neither experienced nor even imagined".
But he said talks could still go ahead "at a later date".
House Democratic Leader Nancy Pelosi said Kim was the "big winner" out of the situation since it gave the North Korean dictator 'global recognition and regard'. "He's going to run this the way he sees fit".
Trump had initially sought to placate North Korea, saying he was not pursuing the "Libya model" in getting the North to abandon its nuclear weapons program. The North has a history of pulling out last minute. Since January, Kim has taken a radically softer approach to foreign affairs, sending his sister to the Olympics in South Korea, meeting with his South Korean counterpart on their shared border and exploding parts of his nuclear testing site Thursday in an apparent sign of good faith.
Arguably, trying to interpret the United States president's moves in diplomatic terms is a mistake.
First, China needs to know that the US will hold it accountable for any efforts to undermine sanctions on Pyongyang.
The decision blindsided treaty ally South Korea, which until now had brokered a remarkable detente between Washington and Pyongyang. Kim has already had two summits with Chinese President Xi Jinping.
Kim Kye Gwan, first vice minister of foreign affairs, issued a statement earlier on Friday saying North Korea was "willing to give the us time and opportunities" to reconsider talks. "I had two meetings, maybe three hours plus, total, enough that I understood him to have understood what I was saying", the top USA diplomat told members of the Senate Foreign Relations Committee yesterday.
"Even before this announcement, Trump's attitude on trade with China had changed a bit", he said.
"China needs to maintain communication with the United States and clarify that it is not in our interest for the meeting to be cancelled", he said. On Monday, Pence suggested that North Korea may end up like Libya if Kim "doesn't make a deal". Managing China's reaction to the cancelled summit will be critical since Beijing had finally begun to implement sanctions after more than a decade of inaction.