Critics also feel that Trump, the first sitting US President to meet a North Korean head of state, lavished praise on Kim, legitimising the young authoritarian leader.
The declaration signed at the end of the summit said the two countries would co-operate towards "new relations", while the United States would provide "security guarantees" to North Korea. South Korea's presidential office has said it's trying to discern Trump's meaning and intent, but also that the allies should explore various ways to "further facilitate" dialogue with the North.
Trump later told a news conference he would end joint US-South Korean military exercises. The annual Ulchi Freedom Guardian joint exercise is scheduled for August. On the agenda were North Korea's illicit nuclear weapons program and a potential deal to denuclearize the country.
He said the U.S. would like "major" North Korean nuclear disarmament by the end of 2020, and that Pyongyang understood there would be "in-depth verification" of the process.
As an "important party", China offered to assist North Korea and the U.S. in further talks and in implementing decisions made at the summit.
This has been taken to indicate that the USA would grant concessions to Pyongyang along the way.
The process was put back on track during a surprise second summit early this month between Kim and South Korean President Moon Jae-in.
Under such conditions, South Korea needs to flexibly change its military pressure in accordance with the Panmunjom Declaration, in which Moon and Kim agreed to build mutual trust after holding the third-ever inter-Korean summit on April 27 at the truce village of Panmunjom.
North and South Korea agreed at high-level military talks Thursday to restore their military communication lines in the Sea of Japan and Yellow Sea areas, according to a joint statement.
North Korea's Kim Jong-un understands that denuclearization must happen "quickly", US Secretary of State Mike Pompeo said Thursday, June 14, warning there will be no sanctions relief for Pyongyang until the process is complete.
North Korean viewers had to wait nearly 20 minutes into the program for Trump's first appearance.