Kim Jong Un calls for 'exponential' nuclear expansion after inspecting new uranium enrichment plant

North Korean leader Kim Jong Un has ordered an 'exponential' expansion of the country's nuclear arsenal after inspecting a newly operational nuclear material production plant, state media KCNA reported on 4 June 2026. The visit, which took place on 3 June, marks the third time Pyongyang has publicly displayed a uranium enrichment facility.

Production capacity doubled

Kim stated that the production capacity for weapons-grade nuclear material had more than doubled over the past five years. He instructed officials to further increase output to meet long-term strategic goals. Photographs published by state media showed Kim walking between rows of cylinder-shaped equipment, which analysts identified as centrifuges used for uranium enrichment.

The production capacity for weapons-grade nuclear material has reached more than double its previous level over the past five years.

A 'historic' milestone

KCNA described the event as a 'historic event that has set up an epochal milestone in rapidly upgrading our nuclear capabilities.' A key consultative meeting on bolstering nuclear forces was held the same day, at which Kim outlined guidelines for accelerating both the qualitative and quantitative expansion of the arsenal. Kim spoke of an 'ambitious future plan designed to beef up our state's nuclear forces at an exponential rate.'

This is a historic event that has set up an epochal milestone in rapidly upgrading our nuclear capabilities.

Location and IAEA concerns

The facility was identified by South Korea's Joint Chiefs of Staff as a uranium enrichment site. While KCNA did not disclose the location, analysts believe it is likely at the Yongbyon nuclear complex. South Korean media Yonhap notes that uranium enrichment plants are suspected at three sites: Yongbyon, Kangson, and Kusong. Unification Minister Chung Dong-young stated in September 2025 that North Korea operates four such facilities. The IAEA's Rafael Grossi warned in April of a 'very worrying increase' in North Korea's nuclear weapons production capacity, confirming 'a rapid increase in activities' at Yongbyon.

During our periodic assessments, we were able to confirm that there is a rapid increase in activities at the Yongbyon nuclear site.

Diplomatic signalling

Analysts suggest the inspection is aimed at reinforcing North Korea's negotiating position ahead of potential diplomatic engagement. Chad O'Carroll, founder of NK News, linked the visit to a possible trip by Chinese President Xi Jinping to Pyongyang, noting that before travelling to Beijing in September 2025, Kim inspected plans for a new ICBM. Yang Moo-jin, former president of the University of North Korean Studies, said Pyongyang appears to be 'deliberately highlighting' its growing nuclear capabilities to signal that denuclearisation is not negotiable with Washington.

The logic would be to demonstrate absolutely that denuclearisation is not possible, right on the eve of contact with the PRC.

Broader context

North Korea withdrew from the Non-Proliferation Treaty in 1993 and has since conducted six nuclear tests and dozens of ballistic missile launches. The country declared its nuclear power status 'irreversible' in 2022. It has conducted eight missile tests so far in 2026. The IAEA estimates North Korea possesses dozens of nuclear warheads. Pyongyang has denied IAEA inspectors access to its nuclear facilities since 2009.