Quotes of the Day

Four years ago, a handful of scientists at a government-run South Korean nuclear research institute were experimenting with a gun that blasts laser beams at elements like gadolinium. The experiments weren't successful and the scientists decided to dismantle the equipment. But before they did, somebody suggested using the laser to enrich uranium—a process that produces the fuel for one type of nuclear bomb. "Scientists are full of curiosity," explains Chang In Soon, president of the Korea Atomic Energy Research Institute, where the experiment took place. "They're interested in this kind of thing."

That unlikely tale was Seoul's explanation last week for the startling news that its scientists had been caught enriching uranium—the very activity Washington is trying to get North Korea to halt. (Pyongyang also has a plutonium-based weapons program, the focus of continuing six-nation negotiations.) South Korea foreswore its nuclear weapons program in 1975, and has since been under the inspection regime of the Vienna-based International Atomic Energy Agency. Last February, the government signed a protocol giving the IAEA the right to more information and to inspect sites anywhere in the country. Seoul had six months to make a full declaration of its nuclear research, and the IAEA started asking uncomfortable questions about the institute in Daejon.

On Thursday, a Science and Technology Ministry spokesman admitted that scientists there produced 0.2 grams of enriched uranium in 2000. (At least 10 kilos are needed to fuel a weapon.) Late last week, the government said it wasn't sure whether it had violated its nonproliferation commitments.

There is no evidence that Seoul is trying to go nuclear, but the revelation couldn't have come at a more awkward time. "This incident is extremely unhelpful and damaging," says a Western diplomat in Vienna. He says Seoul must be dealt with sternly or countries like North Korea and Iran might reasonably object that they've been unfairly vilified for developing their own nuclear programs. Not surprisingly, Seoul is in serious spin mode. Across the DMZ, North Korea's Kim Jong Il must be enjoying a quiet chuckle at its expense.

• Donald MacIntyre | Seoul
• Seoul's admission of nuclear experiments raises uncomfortable questions