To begin with, in agreeing to meet personally with Kim at all, Trump elevated Kim's status enormously. Following the summit, China's foreign ministry suggested the global community consider lifting sanctions on North Korea.
Tensions between the two nations have been the epicenter of heightening geopolitical tensions previous year, with North Korea taking center stage in Trump administration's foreign policy agenda.
Critics are charging that the letter was closer to North Korea's preferences than the "comprehensive, verifiable, irreversible de-nuclearization" sought by the United States. He said it would "increase the pressure on Iran" to give up its nuclear infrastructure and capabilities.
"After the crisis we went through with our interlocutors when Otto came back in the condition he did ... the North Koreans sent to us the de-escalation proposition that we shared with the White House last summer and that was a part of a lot of these efforts to reach out and to try and de-escalate".
Following his withdrawal from the pact, Trump has announced the restoration of USA sanctions, while European leaders are trying to preserve the deal.
Trump added in his remarks on Tuesday that the deal "cannot be renegotiated in any way".
During his press conference in Singapore following the signing of the joint statement, Trump praised Kim for taking the "first bold step" for his people, proof "real change is indeed possible".
Mr Trump said scrapping them will save a "tremendous amount of money", but he added that they could be reinstated if co-operation from the North declines. The US forces in South Korea, meanwhile, told Stars and Stripes magazine that it had not received updated guidance on cessation of training exercises, and "will continue with our current military posture until we receive updated guidance".
Trump, reiterating his trust of Kim, said: "I do trust him, yeah".
South Korean President Moon Jae-in met with Kim Jong-un weeks ago. "They want the remains of their fathers, and mothers, and all of the people that got caught into that really brutal war, which took place, to a large extent, in North Korea".
After meeting privately and with aides, Trump and Kim moved into the luncheon at a long flower-bedecked table.
"The North Koreans are freezing their ICBM and nuclear tests, and the Americans are freezing our military exercises with the South Koreans". They walked outside together after the lunch, stopping briefly to look at the US president's special limousine.
Trump was also accused of being overly flattering is his language toward Kim, who leads one of the most repressive governments in the world, after saying the North Korean leader was a "talented man" who "loves his country very much".
Experts believe the North is close to being able to target the entire USA mainland with its nuclear-armed missiles, and while there's deep scepticism that Kim will quickly give up those hard-won nukes, there's also some hope that diplomacy can replace the animosity between the United States and the North. He explained that they're too expensive anyway and, besides, they are quite provocative to North Korea.
President Donald Trump jokingly asked reporters to make him and North Korean leader Kim Jong Un look "nice, handsome, and thin".
According to a joint statement signed at the end of the summit, both parties agreed on the complete denuclearization of the Korean peninsula, although few specific plans have been laid out on the removing North Korea's nuclear arsenal.