The statement by the Foreign Ministry in Seoul came hours after the U.S. president ordered Mr Pompeo to delay his trip because of what he sees as a lack of progress on nuclear disarmament talks with the North. Pompeo, South Korean Foreign Minister Kang Kyung-wha expressed regret that the trip had been canceled.
USA president postponed Pompeo's planned trip to Pyongyang and blamed China for stalling efforts to disarm North Korea.
China's Foreign Ministry said on its website on Saturday, "The U.S. statement violates basic facts and is irresponsible".
Officials also declined to say how the letter was transmitted, but North Korea has been increasingly communicating through its United Nations mission, known as the "New York Channel".
"The opening of the liaison office had been planned under smooth progress (in denuclearization efforts), such as Pompeo's North Korea trip and the South-North Korea summit, but we believe there is a need to once again review the issue since a new development has emerged", Cheong Wa Dae spokesman Kim Eui-kyeom told a daily press briefing.
"Because of our much tougher trading stance with China, I do not believe they are helping with the process of denuclearisation as they once were" despite United Nations sanctions against the nuclear-armed regime, Trump said.
Kim, who once ran a fisheries export business in Japan, said he has friends there who print out his emails and mail them to his younger sister and other relatives in North Korea. Trump "overplayed the gains" from his Singapore summit with North Korean leader Kim Jong Un and needed someone else to blame, Lee said.
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His letter exchanges began in the early 1990s when he found the address of his sister, who years earlier sent him a photo of his parents and the news of their deaths via a former neighbor who had acquired USA citizenship and visited the North. She acknowledged she was a bit disappointed by his meeting with Kim Jong Un in June.
South Korea will propose to North Korea the withdrawal of guard posts in certain designated areas of the Demilitarized Zone, rather than committing to reducing by an equal number of border facilities, its defense chief said Friday.
"We all knew that North Korea wasn't going to denuclearize".
Only now does Trump realize that North Korea did not intend to give up its nuclear weapons, at least not as soon as he wanted, Lee said. And to think that immediately after that meet-up, Donald Trump proudly proclaimed the nuclear threat from North Korea to be.
In an effort to reassure Kim, the Trump administration canceled or delayed joint military drills with South Korea while it continued with smaller exercises.
Cheong said the cancellation of Pompeo's visit put the ball in the court of South Korean President Moon Jae-in, who is due to visit Pyongyang in September. Trump is now said to be genuinely peeved that the rogue state has been messing with one of his best would-be storylines, that of him as worldwide negotiating super-genius. Trump has given Pyongyang the advantage and undercut his own negotiators.