Flashpoints | Security | East Asia

Where Does North Korea’s Nuclear Program Stand in 2026?

Here’s what satellite imagery and the IAEA are telling us.

In this photo provided by North Korean state media, leader Kim Jong Un visits a new uranium enrichment facility on June 3, 2026..

Nearly two decades after international inspectors were expelled from North Korea, satellite imagery and open-source analysis remain the only windows the outside world has into Pyongyang’s nuclear program. What that window shows in late 2026 is a program that is visibly expanding, on multiple fronts at once.

On August 28, the International Atomic Energy Agency (IAEA) issued a report to its Board of Governors documenting the construction of a second uranium enrichment facility at North Korea’s main Yongbyon nuclear complex. The new facility could house up to 28 centrifuge cascades, alongside an already-operating expanded annex at the Kangson enrichment site. The agency identified the new two-story building by comparing satellite images taken during its construction with state media photographs of a June 2026 visit by Kim Jong Un, during which centrifuges and cascades resembling those at known enrichment sites were visible.

IAEA Director General Rafael Grossi told the Board that the continued operation of the Kangson and Yongbyon facilities, together with the reported further expansion of weapons-grade nuclear material production, was “a cause for serious concern.” The IAEA has not had inspectors on the ground in North Korea since 2009 and now builds its assessments entirely from commercial satellite imagery and open-source material, including North Korean state media itself.

The picture built up over 2026 by independent monitors is consistent with the IAEA’s findings. Analysts tracking Yongbyon have documented near-continuous water discharge from the 5-megawatt-electric (MWe) reactor, North Korea’s original plutonium producer, consistent with it running through what is now believed to be its seventh irradiation cycle since October 2024, alongside periodic steam activity at the Radiochemical Laboratory suggesting reprocessing campaigns. A separate site review by Daily NK reached similar conclusions, also noting that the long-delayed Experimental Light Water Reactor (ELWR) is showing renewed discharge activity after a shutdown period, and that demolition of the old, unfinished 50 MWe reactor at Yongbyon continues in parallel with the new construction.

A review by 38 North covering 2025 activity framed this as a direct response to political direction: Kim Jong Un had described that year as decisive for “bolstering up the nuclear forces,” and the satellite record showed the 5 MWe reactor running steadily since January 2025. 38 North also flagged pre-operational testing of the ELWR, a probable summer reprocessing campaign, and construction of what are assessed to be new enrichment and waste-storage buildings.

North Korea’s declared and suspected enrichment infrastructure now spans at least two locations at Yongbyon (the original uranium enrichment plant and the new building identified in August) plus the Kangson facility outside Pyongyang, whose 2024 annex expansion appears to have become operational around January 2026. Because clandestine centrifuge halls are comparatively easy to conceal, nonproliferation researchers have long argued that the more reliable way to bound North Korea’s enrichment capacity is to track its uranium supply rather than guess at hidden buildings. In 2021, an academic study using satellite-based land-use analysis around the Pyongsan uranium mill concluded that North Korea’s tailings output implies it could produce substantially more milled uranium than it is believed to currently be enriching, meaning supply is not the constraint on how fast the program could grow.

Unlike uranium enrichment, North Korea’s plutonium supply chain runs through a small number of well-mapped facilities. It starts at the Pyongsan Uranium Concentrate Plant, roughly 45 kilometers from the DMZ, which remains the country’s only confirmed source of yellowcake. Uranium ore is processed there into oxide concentrate before being shipped to Yongbyon for conversion into reactor fuel. That fuel feeds the 5 MWe reactor, whose spent fuel rods are then........

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