This year, North Korea participated in the recent Olympics in South Korea, and Kim subsequently expressed a willingness to engage in denuclearization talks.

People wave the Korean unification flag during the inter-Korean summit, near the demilitarized zone separating the two Koreas, in Paju, South Korea, April 27, 2018.

Joint statement

The inter-Korean summit is expected to produce a joint statement committing to the denuclearization of the Korean Peninsula, and also a clear definition of what a denuclearization outcome would entail.

"It is very difficult to know at what level they will agree on. This is more so because it is not something that can be fully completed at the summit between two Koreas," said the chairman of the Inter-Korean Summit Preparation Committee.

While North Korea will make a nuclear deal only with the United States, Moon wants to use the inter-Korean summit to create a framework for talks between Kim and Trump.

"For President Moon Jae-in, he would like to see a substantial improvement in relations between the U.S. and North Korea by serving as a mediator," said Kim Yong-hyun, a professor at Dongguk University in Seoul.