"Kim Jong Un, he really has been very open and I think very honorable from everything we're seeing", Trump said alongside visiting French President Emmanuel Macron.
"It occurred due to a process comparable to a "mirror image" of the explosion, that is, a rock collapse, or compaction, for the first time documented in North Korea's test site", it said. "Maybe it will be wonderful or maybe it won't".
But the best evidence that global agreements of this nature can prove unverifiable or ephemeral comes in connection with North Korea itself.
And last week, North Korea pledged to halt its nuclear and missile tests ahead of the summit.
"I wouldn't want to take it that far because they are already talking", he said.
The North-South summit at the border truce village of Panmunjom is set to be followed by a meeting between Mr Kim and US President Donald Trump in May or June.
The second research team led by Liu Junqing at the Jilin Earthquake Agency with the China Earthquake Administration in Changchun said in a paper published last month in Geophysical Research Letters that the "rock collapse ... was for the first time documented in North Korea's test site". This can not be viewed as a bilateral U.S. Trump also said, "If the meeting when I'm there isn't fruitful, I will respectfully leave the meeting". The aide and other officials requested anonymity to discuss the plans as they were not authorized to discuss them.
Foster Klug, the AP's bureau chief for South Korea, has covered the Koreas since 2005. The man earlier tipped for the post, Korea expert Victor Cha, was passed over in January. Conservative critics argued that the aid was diverted to accelerate North Korea's weapons development.
Harris has spent almost 40 years in uniform and has a reputation as a straight talker. But, they wrote, Seoul and Washington must make clear that any freeze needs to come with unfettered United Nations inspections and visible dismantling of the North's nuclear infrastructure.
It's an example of the kind of trickery we are going to face.
"We can't imagine any scenario where the North Koreans are even going to contemplate giving their nuclear weapons without a peace treaty and without security guarantees", said Suzanne DiMaggio, director and senior fellow at New America in NY, who facilitated talks in Oslo that led to USA citizen Otto Warmbier's release from North Korea. The Trump administration supplemented those restrictions with unilateral US sanctions against firms that had conducted illicit trade with the North.
Trump applauded Kim's announcement to cease testing, but formal steps toward denuclearization have not yet been taken. There is still uncertainty about what he seeks in return.
A statement by U.S. trade minister Robert Lighthizer and his South Korean counterpart Hyun Chong Kim described steel terms as being agreed, with the KORUS free-trade deal changes as an "agreement in principle on the general terms" while details are still being finalised. On the one hand, Abe would have wanted to remind Trump of Japan's steadfast support for the United States' ultimate goal of denuclearising North Korea.