At the UN, North Korea repeated its request to the USA to declare the end of the 1950-1953 Korean war, which ended with a ceasefire but without a peace treaty.
Though the speech was relatively positive, the United States leader did end by saying he would not be reducing sanctions placed on the country until it was completely denuclearized.
But the Trump Administration has said that sanctions should stay in place until North Korea denuclearises.
US President Donald Trump said he and North Korean leader Kim Jong-un "fell in love" over the course of their on-again off-again detente, hours after Pyongyang's top diplomat said there was "no way" the country would disarm under current conditions. Tangible progress since then though has been scant.
"The reason behind the recent deadlock is because the U.S. relies on coercive methods, which are lethal to trust-building", Ri said in his speech.
Speaking to the United Nations General Assembly on Tuesday, Trump praised Jong-un for his "courage" in beginning to disarm, and boasted of his success in negotiating a deal between the two countries.
"The perception that sanctions can bring us on our knees is a pipe dream of the people who are ignorant about us".
What has happened since Singapore?
Somewhere the middle of his speech, after suggesting the USA was about to go to war with the North Korea when he took office, Trump waxed nostalgic about how he and Kim exchanged threats to annihilate each other with nuclear weapons, then claimed it was Kim's "beautiful letters" that turned everything around.
Trump, on the other hand, seemed more optimistic about US-North Korea relations.
Ryder Cup 2018: Woods bemoans poor finish with Reed
After not playing in Friday morning four-balls, Watson and Simpson were the only US pairing to take a lead in afternoon foursomes. The 42nd Ryder Cup opened amid a cacophony of noise as nearly 7,000 fans created a remarkable atmosphere around the first tee.
However, earlier this month South Korean leader Moon Jae-in completed a high-profile, three-day visit to Pyongyang - the first by a Southern leader to the North's capital in a decade.
"It's so easy being presidential", Trump also said Saturday.
The tests, some of which entered Japanese airspace, became so rampant that Donald Trump last August warned Kim that he would face "fire and fury like the world has never seen" if he continued.
Trump on Saturday, September 29, elevated his recent praise of Kim to new heights, at a West Virginia rally in support of local candidates for his Republican Party.
"And then we fell in love, okay?"
Even so, the tone of Mr Ri's speech was dramatically different from previous year, when he told the UN General Assembly that targeting the U.S. mainland with North Korea's rockets was inevitable after "Mr Evil President" Trump called Kim a "rocket man" on a suicide mission.
"No really. He wrote me attractive letters".
This November 29, 2017, image provided by the North Korean government on Thursday, November 30, 2017, shows North Korean leader Kim Jong Un, third from left, and what the North Korean government calls the Hwasong-15 intercontinental ballistic missile, in North Korea.
Nevertheless, Trump cheered his summit, claiming that North Korea "no longer" posed a nuclear threat.