However, some observers say it could also be a regular exchange between the ruling parties of the two communist countries since Ryu attended a meeting between North Korean leader Kim Jong-un and China's special envoy Song Tao in Pyongyang last month.
"Hopefully the June 12 summit in Singapore will result in a blueprint of acceptable and enforceable behavior going forward", Wilson said.
Amid the rumors that have been swirling around the high-profile meeting, this looks highly speculative.
The State Department, led by Secretary of State Mike Pompeo, delivered a statement confirming that the three hostages had boarded a flight home.
Kim is trying to find ways around Washington's principle of no economic aid until complete denuclearization and is seeking immediate rewards at each stage. State-run media has repeatedly chided the U.S. for saying North Korea must give up its weapons completely for sanctions relief, with a foreign ministry spokesman saying this month the USA was "deliberately provoking" the country.
North Koreans appeared optimistic about the summit, the chief of the U.N. World Food Programme (WFP), David Beasley, told reporters in Seoul after a trip to the North. "They need enormous amounts of electricity in North Korea, to work with them to develop infrastructure".
While all players are agreed on the eventual goals of denuclearisation and the signing of a peace treaty, everyone has their own definition of what those goals mean and how progress should be made.
"This has been a tradeoff that has been pending for 25 years, " Pompeo said, referring to the long history of failed negotiations with Pyongyang as well as the North Korean narrative that the United States is a mortal threat.
The world seems divided in the case of Koreans.
Moreover, Beijing has in recent months drastically increased its pull over Pyongyang.
Kim's latest visit was to the northeastern port city of Dalian, as the two countries seek to mend frayed ties with a diplomatic thaw in the region gathering pace. They will get private capital that comes in.
There were also rumours that the summit may be held in Beijing, China.
People walk past the Marina Bay Sands hotel in Singapore.
Singapore also has a track record for putting together top-level worldwide summits.
It's said Trump may pick the unorthodox resort and gaming complex overlooking the bustling Marina Bay, featuring a swimming pool and observation deck piggybacking on a "roof terrace" atop three 55-story hotel and condominium towers, as to return his personal favor to Sand's CEO and chairman Sheldon Adelson, a long-time donor.
White House national security adviser John Bolton said on CNN's "State of the Union" on Sunday that North Korea's future could be "unbelievably strong" if it follows through on its commitment to denuclearize.
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