David Lumb has asked an interesting question on the BBC Facebook page. , external"What is the atmosphere of the summit? Do all sides seem like they’re being genuine and working towards the common goal of peace in the region?"

We've asked the BBC's Jonathan Head in Hanoi to answer that one:

"I would say both were guarded in what they said to reporters and in Trump’s case, made an effort to lower expectations. They are both self-conscious performers for the cameras, and repeated the demonstration of ease with each other seen in Singapore. But that suggests little about the actual talks."

Of course the apparent early end to these talks could be a sign things have changed.

Could leaving early be a possible tactic employed by Mr Trump?

This is the scene right now outside the Metropole, with heavily-guarded vehicles lined up ready to go. Looks like there'll be movement before long.

Stick with us - we're all poised for what comes next.

Image source, Reuters

While we wait for the latest news from the leaders themselves, here's a side angle to the summit. We asked Oliver Hotham, managing editor at NK News, whether we might ever see Donald Trump making a visit to North Korea. He had this to say:

Plates and menus were set up at the dining room of the Metropole hotel, but Mr Kim and Mr Trump were a no-show, says Washington Post reporter David Nakamura.

The White House spokeswoman Sarah Sanders has told reporters talks will wrap up in the next 30 to 45 minutes and the president would leave.

"She declined to say whether there would still be a joint signing ceremony but appears unlikely," says David Nakamura of the Washington Post.

We're seeing live footage now of Mr Trump's presidential car waiting outside the hotel.

Could Mr Trump's ex-lawyer Michael Cohen's testimony be the reason behind the reported program shift?

It's not quite clear what exactly is happening, but journalists on the ground are reporting that lunch between Mr Trump and Mr Kim has been pushed back.

Quoting a White House pool, several journalists say they've been told "there has been a program change". Press Secretary Sarah Sanders is due to "come explain".

A press conference between both leaders that was due to take place at 16:00 local time (09:00 GMT) is now reportedly being brought ahead to 14:00.

We're getting word that the talks are drawing to a close. We could see some movement from the leaders in half an hour. That means we're close to finding out what they've actually agreed in this meeting.

The US policy has long been that North Korea needs to abandon its nuclear weapons programme entirely and allow international inspectors to confirm it has done so. But that has been scaled back since Mr Trump started talking to Mr Kim.

As analyst Ankit Panda explains, in his opening comments Mr Trump emphasised that he "doesn’t care about the speed of denuclearisation and really placed emphasis on the lack of testing".

A "formal moratorium agreement" - where North Korea commits to never testing nuclear devices and missiles again "seems likelier".

North Korea has been telling its people to be on "their best behaviour" while Kim Jong-un is away, says managing editor of NK News Oliver Hotham.

It’s most likely to be this guy - North Korea's ceremonial head of state Kim Yong-nam. He's also the head of the rubber-stamp parliament, the Supreme People’s Assembly, says BBC Monitoring.

The 93-year-old senior official has seen the rule of all three North Korean leaders in his career.

Image source, Getty Images

Is North Korea really a threat? Why can’t they have nuclear weapons? Are they still at war? Why are there so few lights in North Korea?

Here are the answers to some questions you may have about North Korea.

So far there has been little talk at this summit about addressing the human rights problem in North Korea - and that should change, argues Human Rights Watch's Phil Robertson.

He tells the BBC:

"Pyongyang wants to be brought in from the cold by the international community, but there can be no glossing over [its] widespread use of forced and child labor, systemic suppression of free expression and civil society, and gulags holding tens of thousands in the mountains.

"Any real progress at the summit will ultimately require reform in North Korea, yet how is the US able to gauge Pyongyang's commitment without raising tough questions beyond the narrow denuclearisation agenda? Pushing human rights onto the summit agenda is both the right thing to do, and the smart thing to do - and remains critical to building a sustained, comprehensive dialogue with North Korea."

From our colleagues at BBC Monitoring, which listens to and watches the world's media:

China says it provided "traffic support" to Kim, who travelled on a train from Pyongyang to Vietnam via China, Communist Party mouthpiece the People's Daily reports. Lu Kang, a spokesperson of the Chinese Ministry of Foreign Affairs, made the remarks at a regular press conference on 27 February. "After deliberations and talks, Beijing offered Kim Jong-un a secure stopover in China before he headed to Hanoi for the second Kim-Trump summit," Lu said.

See more on Kim’s various modes of travel

Not everyone is happy with the friendly welcome Mr Kim is receiving. In an interview with the BBC this week, North Korea human rights researcher Olivia Enos said Kim Jong-un was a "brutal dictator" who needed to be held accountable.

Here's what Mr Kim and Mr Trump are reportedly having for lunch today. Always lots of interest in what gets served at these summits. Apple foie gras jelly sounds... interesting?!

From insults and threats to a historic meeting where they "fell in love", here's a sum-up of the (sometimes turbulent) relationship between the US president and North Korea's leader.