Publicity stunt or leap for peace?

Donald Trump and Kim Jong Un's meeting in the Korean Demilitarized Zone produced a barrage of headlines and images, but left analysts questioning whether it was a small step for publicity or a giant leap for peace.

The impromptu encounter saw Trump briefly crossing over the demarcation line -- becoming the first sitting US president to step into Pyongyang's territory.

It came months after their second summit in Hanoi broke down over what the nuclear-armed North would be willing to give up in exchange for sanctions relief.

After around an hour of talks in Panmunjom -- the "truce village" in the DMZ that has divided the peninsula since the two sides and their allies fought each other to a stalemate in 1953 -- Trump emerged to say the two would begin working-level talks in the next few weeks.

He also invited the North's leader to Washington "at the right time", he added.

It was a more substantive outcome than many had expected after Trump issued his Twitter invitation to Kim and said the meeting could be as short as two minutes to simply "say hello".

But analysts questioned whether it would be enough to create sustainable progress in a process that has already been running for years and has regularly become bogged down.

Vipin Narang, a professor at the Massachusetts Institute of Technology, said the "reality show theatrics" of Panmunjom were worth it if they led to effective working-level talks. "If not, then we will keep tuning into this same show for the next 15 months," he added.

While the Trump administration is adamant it wants to see North Korea give up its nuclear arsenal, Pyongyang has never publicly declared it is willing to do so, referring instead to the wider and more ambiguous "denuclearisation of the Korean peninsula".

The Panmunjom meeting gave both leaders "a good reason to seek dialogue again", said Hong Min, a senior researcher at the South's state-run Korea Institute for National Unification.

But Mintaro Oba, a former State Department official in the Obama administration, called it a "temporary burst of momentum".

"We are engaged in a sort of 'defibrillator diplomacy' with North Korea: keeping the process alive through an occasional injection of energy, but never treating the underlying disease," Oba tweeted.

With a presidential election in the US next year, Trump's dramatic steps into North Korea will be a "useful tool" on the campaign trail, said Koo Kab-woo, a professor at the University of North Korean Studies in Seoul.

The visit also boosted Kim's image; a sitting US president visiting a country which it calls pariah state.