During his meeting with Trump at the inter-Korean truce village of Panmunjom on June 30, Kim did not make specific remarks about how to realize security guarantees promised to North Korea, according to the diplomatic sources.
"Part of the reason for the failure of North Korea policy over the last decades, is not having a holistic, long-term approach", he added.
The paper said that establishing new relations between the North and the US and building lasting peace on the Korean Peninsula is anything but a "gift" to Pyongyang, adding Washington should do its own part, such as by making efforts to remove its nuclear threats against the North.
North Korea's elections and subsequent parliamentary session following the February summit saw major government shuffles that, among other things, included a constitutional revision that meant Kim was not only "supreme leader" but, for the first time, "represents the nation".
Previously, North Korea's official head of state was the president of the titular parliament, known as the Presidium of the Supreme People's Assembly.
Despite the summits between Trump and Kim in Singapore and Hanoi, the United States has kept up pressure on countries to implement the sanctions - and on North Korea to abide by them.
North Korea's Hwasong-15 intercontinental ballistic missile is capable of hitting anywhere inside the continental United States in the event of war, US Forces Korea has confirmed in its 2019 Strategic Digest command publication.
The focus is on whether North Korea will make a detailed request at envisioned working-level talks between the two countries, which Washington has been eager to resume by the end of this month.
Ortagus said Washington's goal remained the complete elimination of all of North Korea's weapons of mass destruction.
According to ANI news reports, if the United States plan went ahead, it would see the sanctions' lifting from North Korea's exports of coal and textiles - considered as a major income source for the reclusive communist nation and that it may effort to take denuclearization negotiations back on track after the Hanoi summit failure. Questioned on the veracity of the report, State Department spokesperson Morgan Ortagus said Tuesday that such a move "would never be the end of a process", but "would be at the beginning".
However, Beijing has also suggested sanctions could be eased to reward Pyongyang for good behavior. Chinese Foreign Ministry spokesperson Geng Shuang also took spoke of the report during a press conference Friday, noting that, during his G20 talks with Trump, Xi "encouraged the U.S.to be flexible, meet [North Korea] halfway by lifting some sanctions in due course and doing other things, and find ways to resolve each other's concerns through dialogue".