North Korean leader Kim Jong Un arrived in Vietnam on Tuesday for a summit with US President Donald Trump where they will try to reach agreement on how to implement a North Korean pledge to give up its nuclear weapons. Trump was due in the Vietnamese capital, Hanoi, at about 9 p.m. (1400 GMT). They will meet for a brief one-on-one conversation on Wednesday evening, followed by a dinner, at which they will each be accompanied by two guests and interpreters, White House spokeswoman Sarah Sanders told reporters on Air Force One. The two leaders would meet again on Thursday, she said. Their talks come eight months after their historic summit in Singapore, the first between a sitting US president and a North Korean leader. There is likely to be pressure on both sides to move beyond the vaguely worded commitment they made in Singapore to work toward complete denuclearization of the Korean peninsula. Domestic critics have warned Trump against cutting a deal that would do little to curb North Korea's nuclear ambitions, urging specific, verifiable North Korean action to abandon the nuclear weapons that threaten the United States. In return, Kim would expect significant US concessions such as relief from punishing sanctions and a declaration that the 1950-53 Korean War is at last formally over. Kim, who traveled from the North Korean capital by train, arrived at the station in the Vietnamese town of Dong Dang after crossing over the border from China. Both Kim Jong Un and Trump are also due to hold separate talks with Vietnamese leaders. US Secretary of State Mike Pompeo also arrived in Hanoi, on Tuesday. He has been Trump's top envoy in his efforts to improve ties with the reclusive North and has made several trips to Pyongyang to negotiate an ending of its nuclear program. Trump told reporters before he left he and Kim would have "a very tremendous summit". Tweeting on Monday, he stressed the benefits to North Korea if it gave up its nuclear weapons. "With complete Denuclearization, North Korea will rapidly become an Economic Powerhouse. Without it, just more of the same. Chairman Kim will make a wise decision!" Trump said. In a speech late on Sunday, Trump, however, appeared to play down any hope of a major breakthrough in Hanoi, saying he would be happy as long as North Korea maintained its pause on weapons testing. "I'm not in a rush," he said. "I just don't want testing. As long as there's no testing, we're happy." North Korea conducted its last nuclear test in September 2017 and last tested an intercontinental ballistic missile in November 2017. Analysts say the two leaders have to move beyond summit symbolism. "The most basic yet urgent task is to come to a shared understanding of what denuclearization would entail," said Gi-Wook Shin, director of Stanford's Asia-Pacific Research Center. "The ambiguity and obscurity of the term ‘denuclearization' only exacerbates the skepticism about both the US and North Korean commitments to denuclearization." While the United States is demanding North Korea give up all of its nuclear and missile programs, North Korea wants to see the removal of the US nuclear umbrella for South Korea. A South Korean presidential spokesman told reporters in Seoul on Monday the two sides might be able to agree to a formal end of the Korean War, which was concluded with an armistice not a peace treaty, a move North Korea has long sought. — Reuters