The Kims have ruled North Korea since the Soviet Union designated Kim Jong Un's grandfather, Kim ll-Sung, as Communist leader in 1948.
Sputnik: Do you think there could be any other concessions, short of lifting sanctions, by the U.S. and/or other countries in the world, the United Nations and so forth?
It was signed by Trump and Kim shortly after they met privately and with their respective administrations, with the paperwork stipulating that Kim has 'reaffirmed his firm and unwavering commitment to complete denuclearization of the Korean Peninsula'.
Trump said he is open to visiting Kim some day in Pyongyang.
"Without Otto this would not have happened", Trump told a post-summit news conference in Singapore.
Kim did pledge to destroy one particular missile-engine testing site, according to Trump-though this was not in the agreement they signed.
Secretary of State Mike Pompeo tweeted that the U.S. negotiating team "delivers for America's swagger".
Even as it is not easy to map the internal faultlines of Kim's regime, the U.S. did enough to get him to turn up in Singapore.
Despite all this, Trump's support from his right-wing political base remains strong, and his followers are likely to trumpet the outcome of the North Korea summit as the president achieving something his predecessors could not. "We did sanctions and all of the things that you would do", Trump said. While North Korean denuclearization is undoubtedly a good thing, some worry that Kim is all talk.
In May 2015, South Korea's spy agency told lawmakers that Kim had ordered his defense chief executed with an anti-aircraft gun for complaining about the young ruler, talking back to him, and sleeping during a meeting over which he was presiding.
Trump's complimentary words about Kim and North Korea have also raised cries of alarm-his statement that things were "rough" in North Korea but also "rough in a lot of places" echoed the "violence on many sides" that drew ire after protests previous year in Charlottesville.