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North Korea has unveiled a new facility for producing nuclear bomb fuel as leader Kim Jong Un called for an “exponential” expansion of the country’s atomic arsenal.

Getting into it: State media disclosed the plant on Thursday, days after Kim toured the site, saying it relied on “more sophisticated technology” but offering no location or start date. The images Pyongyang put out show Kim moving past tight rows of silver tubing and piping that look like the inside of a centrifuge hall. South Korea’s Joint Chiefs of Staff identified it as a uranium enrichment facility, the third such site North Korea has publicly disclosed.

Kim claimed the country’s capacity to produce weapons-grade nuclear material had more than doubled over the past five years, a number nobody outside the country can actually confirm.

Kim also framed the buildup as a response to mounting danger, citing a long-term confrontation with what he called the “most ferocious enemies” and calling “the position of a nuclear weapons state” his country’s “invariable” stance. He vowed to “beef up our state’s nuclear forces at an exponential rate,” praised his scientists, and pointed to a new five-year nuclear program approved at a recent party congress.

This all comes as the US intelligence community believes that North Korea has enough material to create up to 90 nuclear warheads and estimates that it has 50 currently assembled. It also has a wide range of intercontinental ballistic missiles, some of which could reach parts of the United States.