South Korean President Moon Jae-in, in a historic first, has just met North Korean dictator Kim Jong Un at the Demilitarized Zone (DMZ).

There it is. pic.twitter.com/NMUrCE78m1

— Jonathan Cheng (@JChengWSJ) April 27, 2018

Moon Jae-in and Kim Jong Un shake hands before Kim steps onto the South side of the DMZ, the first time ever for a N Korean leader ahead of the #interkoreansummit pic.twitter.com/0m5uNIpVKG

— Joseph Kim (@josungkim) April 27, 2018

unimaginable even six months ago. what a moment. pic.twitter.com/DLwwTaELL5

— Daniel Tudor 다니엘 튜더 (@danielrtudor) April 27, 2018

https://twitter.com/chadocl/status/989663321161793537

And there was a bit of ad-libbing:

And Moon walks into North Korea. Was that planned? Didn't look like it.

— Benjamin Silberstein 벤자민 실버스타인 (@benjaminkatzeff) April 27, 2018

Kim and Moon cross the MDL pic.twitter.com/gFP6xKjCGy

— NK NEWS (@nknewsorg) April 27, 2018

WOW. And this:

The historic moment Kim Jong Un shook hands with Moon Jae-I and crossed into the South pic.twitter.com/ALvopzgmzw

— NK NEWS (@nknewsorg) April 27, 2018

North Korean Leader Kim Jong Un crosses inter-Korean border to begin summit meeting with South Korean President Moon. It is the first time a member of the Kim dynasty has set foot on southern soil since the end of the Korean War in 1953. pic.twitter.com/DdDqzkYzpA

— NBC News (@NBCNews) April 27, 2018

Guys, this isn’t the Berlin Wall coming down, but pay attention. This can still go pear-shaped but Kim invested a lot of prestige and 60 years of Communist rhetoric to do this. He’s made the same investment in agreeing to meet Trump. He has to bring back something useful or he’s on borrowed time in North Korea. And if Moon and Trump let it appear Kim is just playing them, they both lose face and neither of them is going to react well to that.