Kim used a speech in front of the Supreme People's Assembly on Friday to criticise the United States president, Donald Trump, and to question whether North Korea would enter into a third round of talks with America, following summits between the two nations in Hanoi and Singapore.
But Kim blew both hot and cold, chastising Washington for the failure of the Hanoi pow-wow.
Said Mr Kim Hyun-wook, a professor at the Korean National Diplomatic Academy: "They want to see the USA make the next move - that the steps that they took, such as returning war remains and shutting down missile sites, are even more grounds to demand the United States to relieve sanctions".
Kim said that he will wait "until the end of this year" for the United States to decide to be more flexible, according to KCNA.
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"If it (the United States) keeps thinking that way, it will never be able to move the DPRK even a knuckle, nor gain any interests no matter how many times it may sit for talks with the DPRK", he said.
South Korea has called for easing sanctions on North Korea by lifting restrictions on suspended cross-border projects, believing that they could incentivize the North to return to the negotiating table. He is one of the best-known personalities involved in the nuclear talks, having met with US Secretary of State Michael Pompeo in Pyongyang and travelling to Washington earlier this year to visit Trump. But experts also see the hand of national security adviser John Bolton in the administration's maximalist demands, advancing what amounts to an unrealistic ultimatum.
Mr Kim said he was open to a third summit with the US President, but set the year's end as a deadline for Washington to offer mutually acceptable terms for an agreement to salvage the high-stakes nuclear diplomacy.
"We were informed by the prison authorities that she would be released on May 3, and it is likely she will be flown back to Hanoi on the same date", he said, when contacted. "As wind is bound to bring waves, the USA open hostile policy toward the DPRK will naturally bring our corresponding acts". While Mr Kim hailed his relationship with Mr Trump, he also said the USA has been making unilateral demands and should abandon that approach. The meeting, which was cut short by the White House and ended without an agreement, also cast doubt on the "true willingness" of Washington to improve relations with North Korea. But he said his personal relationship with the American president remains good. He's exploited his new relationship with South Korea and his revitalized ties to China. "A third summit could happen", Trump said. In their first summit last June in Singapore, Trump and Kim issued a vague statement calling for a nuclear-free Korean Peninsula without describing when or how it would occur.
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The US President responded to the remarks by saying he agreed with Mr Kim about their relationship, and also expressed a desire for another summit.
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But Kim Jong Un was sharply critical of the South Korean government, arguing it should not act as a "mediator" or "booster" for hostile forces, but instead act in the interests of the whole Korean nation.
"I will not hesitate in signing an agreement only if it is written in a way that meets the interests of the DPRK and the US, and is fair, mutually acceptable, and this will entirely depend upon with what attitude and calculus the USA would come up with", he said, using the abbreviation of the North's official name, the Democratic People's Republic of Korea.
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