In light of the steps taken by the country towards denuclearisation, North Korea has sought relief in sanctions.
Kim will pay an official visit to Vietnam at the invitation of Vietnamese President Nguyen Phu Trong before his meeting with Trump.
Citing an unnamed source, Yonhap news agency reported on Tuesday that Kim Hyok-chol will be the new counterpart to Stephen Biegun, the US special representative for North Korea.
Kim, however, warned he might have to seek a "new path" if the US maintains sanctions and demands unilateral concessions, The Washington Post reported.
It was the first official report of a weapons test by North Korea since it began diplomatic process with Washington over its nuclear and missile programme.
The State Department said in a short statement Wednesday the officials would meet later “when our respective schedules permit.” It offered no reason, and the North’s propaganda services has not mentioned the meeting.
The ministry said North Korea could bring back its "pyongjin" policy of simultaneously advancing its nuclear force and economic development if the United States doesn't change its stance.
Moon has previously said that Kim told him he would visit Seoul within this year when the leaders met in Pyongyang in September.
In May, following the first summit between North Korean leader Kim Jong-un and South Korean President Moon Jae-in, the North Korean military had destroyed tunnels at its Punggye-ri nuclear test site in the presence of foreign media, although nuclear
Pompeo departed from Tokyo on Saturday, where he spent the first leg of a tour that will include stops in Pyongyang, South Korea and China.
Trump sought to bolster his claim by implying that Obama had "essentially" told him so directly.
Pompeo, who has been leading Trump administration's effort with North Korea, plans to travel to Pyongyang soon to work on another meeting between Trump and Kim.
North Korea leader held talks with South Korean President Moon Jae-in in Pyongyang
The leaders of North and South Korea announced the joint statement to a group of North and South Korean reporters after a closed-door meeting Wednesday morning.
The meeting between the two leaders came about four months after they last met on May 26 inside the Demilitarized Zone that divides the two Koreas.
North Korea will be staging a major military parade, huge rallies and reviving its iconic mass games on Sunday to mark its 70th anniversary as a nation.
Kim reconfirmed his firm commitment to the complete denuclearisation of the Korean Peninsula, South Korean President Moon Jae-in's special envoy said in a press briefing after visiting Pyongyang on Wednesday.
"We took the step to suspend several of the largest military exercises as a good faith measure. We have no plans to suspend anymore", said Mattis.
Korean Central News Agency (KCNA) on Sunday night confirmed the release of Tomoyuki Sugimoto, a Japanese who had been under investigation for an unspecified crime.
In a statement, Chinese foreign ministry spokesman Lu Kang said Trump's allegation was not based on facts and was "irresponsible".
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