Though Kim's letter mentions sticking to the joint statement released in Singapore, which does mention denuclearization, North Korea has consistently resisted efforts to verifably disarm.
At the summit, the two leaders pledged to work towards complete denuclearisation of the Korean peninsula and ease tension between their countries, still technically at war, since the 1950-53 Korean War ended in a truce, not a peace treaty.
Kim did not meet with the secretary of State. But at the same time, Trump and Kim face huge audience costs at home.
In its report, the United States pointed the finger at China and Russian Federation for continuing to sell refined petroleum products to North Korea.
Trump responded to that setback with a tweet: "I have confidence that Kim Jong Un will honor the contract we signed &, even more importantly, our handshake".
Trump also faces credible domestic audience costs.
This would signal a shift in tone from Pyongyang's previous unwillingness to open up dialogue with Tokyo, which has been somewhat sidelined amid the flurry of diplomacy over North Korea's nuclear program, resulting in a recent thaw in relations between the North and the United States.
Pompeo traveled to Pyongyang for two days last week in a bid to flesh out denuclearization commitments made during last month's historic summit between Trump and Kim.
And North Korea has not shown an inclination to share the economic data that the International Monetary Fund would require for membership.
Hundreds of remains have been repatriated since 1990, but the process has been fraught with mistrust.
How will the talks play out? That is why Pyongyang has turned to Seoul and Beijing amid this process.
Neither U.S. nor South Korean officials would immediately confirm the report.
Trump also announced that the USA would suspend "war games" with South Korea.
North Korea failed to show up Thursday for talks with USA officials on returning the remains of American war dead from the Korean War in the early 1950s, a new sign of tension between the two countries.
The real game will be after the midterm elections, when Trump's reelection will be on the line.
The letter, which Trump referred to as a "very nice note" in a tweet, highlights Jong Un's intention to honour the agreement signed between the two, exactly a month ago in Singapore.
Ding Rongjun is assistant professor in diplomacy at Tongji University.
He may be in the United Kingdom but the American leader's attention was on the far East as he tweeted a letter received from Mr Kim following their historic summit in Singapore in June.
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