North Korean media has reported the South Korean visit, but no details of the talks. According to the report, White House press secretary Sarah Huckabee Sanders on Friday said the meeting wouldn't take place "until we see concrete actions that match the words and the rhetoric of North Korea".
"We are continuing to prepare on a number of levels", she told a regular briefing.
The North Korean government might have also been holding off because it's concerned the summit proposal could fall through, which could be hard to explain to their own public.
"I feel they're approaching this matter with caution and they need time to organise their stance". He says that it's in the "very early stages". First came Kim Jung-un's declaration that he will never use nuclear weapons against South Korea, in a gesture that aimed to suggest that blood is, after all, thicker than political differences. Trump's announcement has raised speculation about whether the meeting will actually go ahead, what North Korea will demand from the US and even where the two leaders might meet.
Tillerson says the first meeting will be about Trump and Kim "getting a sense of one another" and determining whether there is the space and will to accomplish something together on the North's nuclear weapons program.
"With respect to the ongoing discussions about a potential meeting between President Trump and Kim Jong Un, as you know it's a very recent development", Tillerson cautioned reporters during a stop in Nigeria on Monday. ".but, again they - they cannot engage in missile testing, they cannot engage in nuclear testing and they can't publicly object to the U.S".
Just days after he stood outside the White House and announced the planned meet between the United States president and the North Korean leader, Chung Eui-yong was in Beijing to brief Xi and China's top diplomats on the fast-moving efforts to address the nuclear standoff. The meeting, if it brings peace, could stabilize countries like South Korea and China.
Delivering South Korean President Moon Jae-in's message, Suh said it is more important than ever for the three countries to step up cooperation to maintain the current peaceful momentum that has been built following the PyeongChang Winter Olympics.
South Korea's minister for trade, Kim Hyun-chong, who has visited the United States twice in recent weeks to seek ways to minimize the damage to South Korean steelmakers, will depart for the U.S. again on Tuesday, a ministry spokeswoman said.
Kono said he and Suh also affirmed that Japan and South Korea will work in close coordination on the issue of North Korea's abductions of Japanese nationals in the 1970s and 1980s.
North Korean media has reported on the South Korean visit to the USA, but not on details of the talks, according to Reuters.