South Korean President Moon Jae-in said he would also go to the DMZ but the "focus" would be on the Trump-Kim encounter, with a possibility of a more formal sit-down at a later date.
Joe Biden has been on the campaign trail since announcing last month his candidacy for the Democratic Party nomination in the 2020 presidential election.
The launch would be North Korea's first such action in more than a year as it seeks to up pressure on Washington with nuclear talks deadlocked.
Kim's private armoured train arrived Wednesday in the Russian border town of Khasan, Russian media reports said, where he was welcomed with bread and salt in a traditional gesture.
Following diplomatic pressure from the Vietnamese government, Malaysian prosecutors had dropped the murder charge against Doan Thi Huong on 1 April.
Trump and Kim held their first landmark summit in Singapore last June, where the pair signed a vaguely-worded agreement on the "denuclearisation of the Korean peninsula".
Kim Jong Un arrived at Beijing train station Tuesday on a visit to China to meet President Xi Jinping, the South's Yonhap news agency reported.
The comments are likely to fuel growing scepticism over whether Pyongyang intends to give up the nuclear weapons program that it has long considered essential to its security.
North Korean women caught fleeing the country to China or who are repatriated from its neighbour face severe punishment including torture, imprisonment and sexual abuse, the report said.
The IMF maintained its forecast that Asia’s economy will expand by 5.6% this year but cut its projection for next year to 5.4%, down by 0.2 point from April.
Trump’s rejection of South Korea easing sanctions alone outlines the official position of the United States and South Korea that the two countries remain in lockstep on North Korea.
In Pompeo’s last trip to Pyongyang in July, North Korea denounced him for making “gangster-like demands.” Pompeo did not meet Kim on that trip.
Washington wants North Korea to first provide a complete inventory of its weapons programs and take irreversible steps to give up its arsenal.
North Korean leader Kim Jong Un “reconfirmed his determination to completely denuclearise” the Korean peninsula.
The charge of a sanctions breach comes as Washington engages North Korea in a bid to convince Pyongyang to give up its nuclear weapons.
The State Department said Pompeo would head on Saturday from Pyongyang to Tokyo, where he would discuss North Korean denuclearisation with Japanese and South Korean leaders.
The 'Financial Times' reported that Pompeo was due to visit North Korea this week but the State Department has not confirmed any travel plans.
Past reunions, some televised, have often unleashed floods of tears, with face-to-face encounters ending in painful separations. The last reunions were held in 2015.
