In a speech to Pyongyang's rubber-stamp parliament on Friday, Kim said the Hanoi meeting had made him question whether Washington is "genuinely interested" in improving its relations with Pyongyang.
Kim said that the North would not stick to summits with the USA for the sake of easing sanctions but it will wait with patience until year's end for a courageous decision from the US, setting an effective deadline for a shift in the USA demands in denuclearization talks.
Kim said the breakdown in talks with the USA had raised the risks of returning to past tensions, and that he would wait "until the end of this year" for the U.S. to decide, according to state news agency KCNA.
President Trump should ignore any offers of another summit with Kim until North Korea is ready to put something verifiable on the table.
During a press conference before his talks with Moon, Trump had mentioned his personal amity toward Kim, saying: "I've had some very strong relationships with others, but I have a very, very good relationship with Kim Jong Un, and I think you see that".
Analysts said, however, the existing strictures on Choe will have little impact on his future diplomatic endeavours, as long as its nuclear dialogue with the USA continues.
At a summit with South Korean president Moon in Washington on Thursday, Trump expressed a willingness to hold a third summit with Kim but said Washington would leave sanctions in place on Pyongyang.
"North Korea has tremendous potential for. extraordinary growth, economic success and riches under the leadership of Chairman Kim".
"As President Trump has repeatedly mentioned, personal relations between me and President Trump are not as hostile as relations between the two countries, and we still maintain excellent relations and can exchange letters whenever we would like to", Kim said. The current US policy of sanctions and pressure is "as foolish and unsafe an act as trying to put out fire with oil", he added.
The two leaders met for the first time in Singapore past year.
Last month, Vice Foreign Minister Choe Sun-hui accused the U.S. of taking a "gangster-like" stance and said they had thrown away a "golden opportunity" in Hanoi. Kim wants major sanctions relief and resources for his country before he'll take even minor steps toward eliminating his nuclear stockpile. "However, the US has taken a more hard-line stance since the Hanoi summit". If the relationship between North Korea and South Korea can be mended, that's a positive development for all concerned, but they can handle that without us.
The U.S. insists North Korea must unilaterally give up its nuclear and ballistic missile programs, which violate United Nations resolutions.
Korean state media also graced Kim with a new title, "Supreme Representative of All the Korean People", which is not mere hyperbole but an actual title ratified by government decree several months ago. He is one of the best-known personalities involved in the nuclear talks, having met with U.S. Secretary of State Michael Pompeo in Pyongyang and traveling to Washington earlier this year to visit Trump.