"The hard part is at what level the two leaders will be able to reach an agreement regarding (the North's) willingness to denuclearise and how it will be expressed in text".
The inter-Korean summit is slated to be held on April 27, where Moon and Kim are expected to discuss on denuclearisation of the Korean Peninsula as well as a peace plan, in an effort to improve the bilateral relations between the two countries.
Trump last week said that although he's looking ahead optimistically to a historic meeting with Kim, he could still pull out if he feels it's "not going to be fruitful".
Mr Moon will greet his visitor at the concrete blocks that mark the border between the two Koreas in the Demilitarized Zone, the chief of the South's presidential secretariat Im Jong-seok said.
Moon and Kim will then hold a second meeting and have dinner before a send-off ceremony for the North Korean delegation.
By Friday evening, we will know whether their leaders were up to the task of turning summit choreography into something of real substance.
Soil from the South Korea's Mt. Halla and North Korea's Mt. Paektu will be used to plant the tree, after which Kim will water the tree with water from the South's Han River and Moon will pour water from the North's Daedong River.More news: Latest Alfie Evans appeal to the European Court of Human Rights rejected
"The reunion of families separated during the Korean War, releasing foreigners who were arbitrarily detained, or addressing the detrimental impact of sanctions on the economic and social rights of the DPRK population, are some of the less controversial issues that can be first included in these talks", he said. Trump said his meeting with Kim may happen in May or early June. Seven years later that prediction has been dropped and he is now seen as a shrewd and ruthless leader.
He is ruthless enough to have had relatives executed but now feels secure enough in power to gamble on Trump, they said.
The North's nuclear arsenal will be high on the agenda.
USA intelligence analysts have spent years examining Kim's family history, speeches, photos and video, and they are now closely analyzing images and reports of his recent high-profile meetings with South Korean and Chinese officials.
North Korea's state-run media declared Thursday that this week's breakthrough inter-Korean summit was made possible due to leader Kim Jong-un's "passionate love" for the peninsula's people.
"But in order for its policy to work, the government must open its ears to various voices on North Korea", the conservative Korea JoongAng Daily recently wrote.
"In view of the research finding that the North Korea nuclear test site at Mantapsan has collapsed, it is necessary to continue to monitor any leakage of radioactive materials that may have been caused by the collapse", the authors said in a summary dated Monday and viewed Wednesday on the university's website.