"What does it mean to stop war games?" said Ambassador Joseph Yun, who served as the US special envoy on North Korea at the end of the Obama administration and during President Trump's initial months in office.
"No-one has shown more contempt for other nations and for the wellbeing of their own people than the depraved regime in North Korea", Mr Trump said during his infamous "little rocket man" speech to the United Nations a year ago.
"Well, you have a different administration, you have a different president, you have a different secretary of state, " Trump said Tuesday, when asked why he thought this attempt on North Korea would turn out differently.
He gave the North Koreans their own copy.
The U.S. leader stressed that existing U.S. sanctions will remain in place until North Korean nuclear weapons "are no longer a factor".
"The world will see a major change", he continued through a translator.
"He is very talented", Mr Trump said.
But as the world was glued to the unprecedented meeting, we also learned that Kim likes a selfie and that Trump is really, really proud of "The Beast", his armoured vehicle. Moreover, Trump's zealousness for making a deal likely prevented him from pressing Kim on other issues, such as North Korea's missile programs and the nation's appalling and rampant human rights abuses.
Ambassador Joseph DeTrani, who served as a top USA negotiator with Pyongyang before the last attempt at diplomacy broke down in 2009, was more optimistic.
At a news conference wrapping up the summit, Trump told reporters he and Kim "have developed a very special bond".
But others were sharply critical, claiming it appeared Mr. Trump offered the freeze in joint military drills without first securing full buy-in from South Korea.
"We're going to denuke North Korea", Trump also told VOA contributor Greta Van Susteren, adding that USA troops stationed in South Korea will remain in place, but announcing one concession long-sought by North Korea not included in the document signed earlier in the day.
The document made no mention of Japanese citizens that country has accused North Korea of abducting. The language in the joint statement was weaker than in previous agreements - the very significant difference being that the North is now much further advanced in its nuclear programme. Those on-again, off-again discussions lasted until 2008, and involved North Korean steps to pause its nuclear activities and shut down parts of its nuclear complex in exchange for economic benefits and security guarantees. The longtime property developer-turned-politician later mused about the potential value of condos on the country's beachfront real estate.
The Kim-Trump summit meeting centred on nuclear disarmament and reducing tensions concluded with a one-page agreement.
In the run-up to the meeting, Trump had predicted the two men might strike a nuclear deal or forge a formal end to the Korean War in the course of a single meeting or over several days.
Lee, State Department's interpreting services division chief, has been an "unsung hero" in negotiations with both North and South Korea for years, Frank Aum, a North Korea expert at the U.S. Institute for Peace at Johns Hopkins University, told TIME.
"There can only be two results: one of moving back, or one of moving forward", the narrator says.