President Donald Trump's third face-to-face encounter with North Korean leader Kim Jong Un could occur along the Korean Demilitarized Zone on Sunday.
"While there, if Chairman Kim of North Korea sees this, I would meet him at the Border/DMZ just to shake his hand and say Hello (?)!", he wrote from Japan, where he is attending G20 summit, on Saturday morning.
Kim Jong-un and Donald Trump during a break in talks at the second US-North Korea summit in Hanoi in February this year.
"The fundamental problem - no working-level meetings and no basic change in at least the United States negotiating position - means that any meeting right now is just pointless theatre", Vipin Narang, an MIT professor of political science, said on Twitter. "Nobody goes through that border", Trump said.
The two countries' militaries conduct annual war games which infuriate North Korea, but they have scaled them back since ties warmed previous year. In fact, if Kim had left the North, Trump nearly certainly would have learned of it in his daily classified national security briefing, not to mention news coverage.
"We see it as a very interesting suggestion, but we have not received an official proposal in this regard", North Korea's First Vice Foreign Minister Choe Son-hui said in a statement carried by the North's official Korean Central News Agency.
The tantalizing possibility of such a historic photo op - which Trump would cast as part of his effort to secure a nuclear deal, but Kim could exploit to burnish his cult of personality - was first dangled in a tweet.
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Trump will be heading to Seoul immediately after the G20 summit in Osaka, where he held a highly anticipated meeting with Chinese President Xi Jinping in a bid to ease trade tensions between the world's top two economies.
Moon and Kim met three times past year, with the final one held last September in Pyongyang.
Trump had late Friday invited Kim to meet at DMZ.
As of now, it is unclear if the north will take him up on his offer.
"Nothing is fixed at the moment, and our previous position of hoping for dialogue between North Korea and the United States remains unchanged", the office said.
He said he'd "have no problem" becoming the first US president to cross the border while he's there.
"That's called a real border", he added.
Since then, there has been little communication, except for an exchange of personal letters between Kim and Trump over the past several weeks.