A leading North Korea-watching website has disputed Foreign Minister Taro Kono's reported remarks that Pyongyang is preparing to conduct a fresh nuclear test even as tensions on the Korean Peninsula ease ahead of a rare summit between the two Koreas.

Kono claimed Saturday during a lecture in the city of Kochi that North Korea is "working hard to get ready for the next nuclear test," citing satellite imagery. But an analysis published Monday by the 38 North blog at the U.S.-Korea Institute at Johns Hopkins University's School of Advanced International Studies disputed his claim that soil had been removed from a tunnel at a site where tests had been conducted in the past.

"While it is unclear whether the foreign minister was referring to activity observed over the last few days or from earlier work conducted after North Korea's September 2017 nuclear test, commercial satellite imagery from March 23 shows quite a different picture: namely, that activity at the test site has been significantly reduced compared to previous months," the report said of activity at the North's main Punggye-ri nuclear test site.