North Korea building nuclear weapon stockpile, says Seoul

North Korea is believed to have accumulated large quantities of weapons-grade uranium, according to South Korea.

Seoul’s Unification Minister Chung Dong-young on Thursday cited an assessment that Pyongyang possesses 2,000kg (about 4,400 pounds) of highly enriched uranium “at a purity of 90 percent or higher”.

If confirmed, the amount would also signal a sharp increase in North Korea’s stockpile of nuclear material.

Intelligence provided by civilian experts reveals that North Korea is operating four enrichment plants, he added.

“Even at this very hour, North Korea’s uranium centrifuges are operating at four sites,” Chung told reporters, only mentioning the known site of Yongbyon, which Pyongyang purportedly decommissioned after talks but later reactivated in 2021.

Foreign experts believe North Korea has built additional uranium-enrichment sites as leader Kim Jong Un has been pushing hard to expand his nuclear arsenal.

The North has long been known to hold a “significant” amount of highly enriched uranium, the key material used to produce nuclear warheads, according to South Korea’s defence ministry.

Enrichment must be pushed to more than 90 percent, the concentration termed weapons-grade, to ensure that the critical mass sets off the chain reaction leading to a nuclear explosion.

According to the International Atomic Energy Agency (IAEA), 42kg (92.6 pounds) of highly enriched uranium is needed for one nuclear weapon; 2,000kg would be enough for roughly 47 nuclear bombs.