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It was the mid-1990s when Nigeria, with technical support and backing from China, began work on what would become Nigerian Research Reactor 1, located at Ahmadu Bello University in Kaduna. The location opened in 2004, and is home to roughly 170 Nigerian workers.

The design, however, used highly enriched uranium, or HEU, a type of nuclear substance often referred to by the general public as weapons-grade uranium. This kind of uranium forms the core of any nuclear weapons material, and the Nigerian material was more than 90 percent enriched, making it particularly attractive for anyone looking to use it.

Since NIRR-1 went online, however, improvements in technology meant that experiments involving highly enriched uranium could now be run with a lesser substance. Across the globe, the IAEA and its partners have worked to swap out weapons-grade material with lightly enriched uranium, or LEU, which is enriched at less than 20 percent, and hence unusable for weapons. In all, 33 countries have now become free of HEU, including 11 countries in Africa.

With just over 1 kilogram of HEU, the Nigerian material, if stolen, would not be nearly enough to create a full nuclear warhead. However, a terrorist group would be able to create a dirty bombwith the substance or add the material into a stockpile gathered elsewhere to get close to the amount needed for a large explosion.

They’re small reactors, they’re not power reactors where the fuel is so radioactive it kills you,” he said. “This is very attractive to a proliferation point of view, and they are research reactors, so they are often at universities without high security.”

Replacing HEU with LEU in research reactors naturally requires caution, as anything nuclear-related comes with risks. But the Nigerian mission was particularly difficult because of security concerns, Hanlon said. He noted that Boko Haram, while not in the Kaduna region, has been operating in Nigeria for quite some time.

“All of our partners understood that operational security was paramount,” Schwartz said. “The world is a safer place today as a result of the determined work to remove this weapons useable Uranium from Nigeria.”

China’s role

The removal operation cost roughly $5.5 million, with the United States contributing $4.3 million. The United Kingdom ($900,000) and Norway ($290,000) also chipped in. But while it didn’t contribute money, China’s role in the operation was outsized — and occurred as the war of words from the Trump administration toward Beijing was reaching a fever pitch, one that did not die down in the weeks to come.

As the October operation was just hours from starting, U.S. President Donald Trump took to the press to discuss nuclear material and China.

“Until people come to their senses, we will build [the nuclear arsenal] up,” Trump told reporters just hours before the Nigeria operation was to begin. “It’s a threat to whoever you want. And it includes China, and it includes Russia, and it includes anybody else that wants to play that game. You can’t do that. You can’t play that game on me.”

By the time the Antonov plane — carrying the HEU, along with American inspectors and security — arrived at Shijiazhuang airport in China on Dec. 6, the arrest of a Chinese technology executive in Canada had inflamed fears of a trade conflict between the two countries.