The United Nations nuclear watchdog says North Korea has restarted its main nuclear reactor.
The International Atomic Energy Agency released a report saying it has observed evidence of cooling water from the plant, indicating it is in use.
The five-megawatt reactor is capable of producing weapons-grade plutonium.
That is one of the crucial elements needed to build nuclear weapons.
The finding poses yet another challenge for the United State and its goal of de-nuclearising the Korean Peninsula.
Some analysts believe it may be a move directed at future talks with the Biden administration.
But will it work?
Presenter: Dareen Abughaida
Se-Woong Koo – Publisher of Korea Expose, a newsletter on contemporary Korean affairs
June Park – Fung global fellow at Princeton University
Graham Ong-Webb – Defence analyst and research fellow at Nanyang Technological University