Mike Baker

If there was any doubt about whether North Korean leader Kim Jong-un intends to keep expanding his nuclear arsenal, a new uranium enrichment facility just put that question to rest, potentially boosting the regime's enrichment capacity by 75% once fully operational.

Exclusive new reporting from the Wall Street Journal is giving us a closer look at the facility inside North Korea's Yongbyon nuclear complex that's long considered the heart of the regime's nuclear program.

Now, if you followed our coverage of North Korea over the years here on the PDB, Yongbyon is a name you've heard before.

It's been one of the most closely watched sites in the regime.

But what's different this time is the anticipated scale of nuclear material that could be produced there.

Analysis by the London-based arms control nonprofit Furtick suggests the site could house more than 9,000 centrifuges capable of producing roughly 160 kilograms of highly enriched uranium annually.

To put that in perspective, North Korea's existing enrichment infrastructure is estimated to produce roughly 215 kilograms of highly enriched uranium each year.

Once this facility reaches full production, Pyongyang's annual enrichment capacity could climb to roughly 375 kilograms.

For context, the International Atomic Energy Agency classifies just 25 kilograms of enriched uranium as a, quote, sufficient quantity to make a nuclear bomb.

And that's important because we're not talking about a regime trying to build its first nuclear weapon.

We're talking about a regime that already possesses a nuclear arsenal capable of threatening U.S.

allies across Asia, and that appears determined to make it significantly larger.

As one of the authors of the Vertec analysis put it, quote, North Korea probably has all the material they'd need for a medium-sized nuclear arsenal already, and now it looks like they're running up the numbers, end quote.

That observation gets to the heart of what we're looking at here.

For years, there was a belief among some policymakers that North Korea's nuclear program might eventually become negotiable, that with enough sanctions relief, diplomatic engagement, or economic incentives, Pyongyang could be persuaded to slow down or even reverse course.

The evidence increasingly points in the opposite direction.

Current estimates suggest North Korea already possesses roughly 60 nuclear warheads and enough fissile material to build at least 90 more.

That's up from roughly 50 warheads just a year earlier, underscoring how quickly the regime's stockpile continues to grow.

And that's why this facility is getting renewed attention as a window into Kim's long-term intentions.

What's also striking is how quickly all of this appears to be happening.