The U.S. special envoy for North Korea said Monday that Pyongyang's claim of a new uranium enrichment facility is provocative and disappointing but not a crisis or a surprise. Washington, he vowed, will keep working closely with its regional partners in response.
Stephen Bosworth's comments, following a meeting with South Korean Foreign Minister Kim Sung-hwan, came as the United States and the North's neighbors scrambled to deal with Pyongyang'sof a highly sophisticated, modern enrichment operation that had what the North says are 2,000 recently completed centrifuges.
"This is obviously a disappointing announcement. It is also another in a series of provocative moves" by North Korea, Bosworth said. "That being said, this is not a crisis. We are not surprised by this. We have been watching and analyzing the (North's) aspirations to produce enriched uranium for some time."
Kim also played down the facility, telling reporters: "It's nothing new."
Top U.S. military officials, however, warned that it could speed up the North's ability to make and deliver viable nuclear weapons. South Korea's defense minister, meanwhile, told lawmakers Monday that Seoul will discuss the possibility of having the U.S. bring tactical nuclear weapons back into the country.
U.S. Defense Secretary Robert Gates said it could enable North Korea to build "a number" of nuclear devices beyond the handful it is presumed to have already assembled. Gates was speaking in Bolivia, where he is attending a regional defense conference.
The American scientist Siegfried Hecker, posted a report over the weekend that said he was taken during a recent trip to the North's main Yongbyon atomic complex to a small, industrial-scale uranium enrichment facility.
Hecker, a former director of the U.S. Los Alamos Nuclear Laboratory who is regularly given rare glimpses of the North's secretive nuclear program, said the North Korean program had been built in secret and with remarkable speed.
Hecker was astonished by the sophistication of the plant, saying it was fully online and as modern as anything typically found in the United States, reports CBS News correspondent David Martin.
North Korea accomplished the feat while under economic sanctions and one of the key questions for North Korea's western adversaries is how the impoverished nation acquired the technology.
"It appears that somebody somehow gave them some technology on how to build this sophisticated equipment that you need for enrichment," Martin said Monday on CBS' "The Early Show." "That somebody could be Iran. That somebody could be Pakistan. North Korea already has between six and twelve nuclear weapons. Nobody wants to see them get any more. But bigger concern as you mentioned is they will sell bomb grade material to another nuclear wanna-be - either a state like Iran or Syria or perhaps even worse, a terrorist organization like al Qaeda."
It wasn't immediately clear why the North chose to reveal the previously hidden facility. It could be a ploy to win concessions in nuclear talks or an attempt to bolster leader Kim Jong Il's apparent heir. The North could also be serious about producing nuclear electricity.
Regardless, it provides a new set of worries for the Obama administration, which has shunned direct negotiations with North Korea following its nuclear and missile tests last year and in the wake of an international finding that a North Korean torpedo sank a South Korean warship in March, killing 46 sailors.
The United States has been working with China, Japan, Russia and South Korea since 2003 to persuade North Korea to abandon its nuclear programs through a framework known as the six-party talks. Bosworth was to travel later Monday to Japan for discussions and to China on Tuesday. He said that Russia would be consulted through "other ways and other measures."
Adm. Mike Mullen, chairman of the U.S. Joint Chiefs of Staff, called North Korea "a very dangerous country."
"I've been worried about North Korea and its potential nuclear capability for a long time," Mullen said on ABC's "This Week." "This certainly gives that potential real life, very visible life that we all ought to be very, very focused on."
"The Obama administration is limited in its options, as U.N. sanctions have not succeeded in freezing North Korean nuclear programs," said CBS News foreign affairs analyst Pamela Falk, based at the U.N.
Falk added it was possible the North had timed the revelation of its advanced nuclear facilities to coincide with President Obama's Asia trip.
North Korea told Hecker it began construction on the centrifuge facility in April 2009 and finished only a few days before the scientist's Nov. 12 visit.
The facility appeared to be primarily for civilian nuclear power, not for North Korea's atomic arsenal, Hecker said. But, he said, it "could be readily converted to produce highly enriched uranium bomb fuel."
Uranium enrichment would give the North a second way to make nuclear bombs, in addition to its known plutonium-based program. At low levels, uranium can be used in power reactors, but at higher levels it can be used in nuclear weapons.
Asked about the possibility of resuming the stalled six-nation nuclear disarmament talks with the North, Bosworth said U.S. officials "do not at all rule out the possibility of further engagement with North Korea." But, he added, "I do not believe in engagement just for the sake of engagement or talking just for the sake of talking."
Bosworth said the uranium revelation does not constitute a failure of U.S. policy toward the country's nuclear programs and that Washington will work closely with "our allies and partners" going forward.
"This is a very difficult problem that we have been struggling to deal with for almost 20 years," Bosworth said. "They are a difficult interlocutor ... but we're not throwing our policy away."
South Korean Defense Minister Kim Tae-young told lawmakers Seoul will discuss with Washington whether U.S. tactical nuclear weapons should be moved back to the South. He was responding to a question about whether North Korea's increasing nuclear threats meant it was time to do so.
Defense Ministry spokesman Won Tae-jae, however, tried to downplay the significance of Kim's comments, saying they did not mean South Korea wanted the U.S. to redeploy atomic weapons right away.
Won also said a U.S. nuclear redeployment only has a "psychological effect" because the U.S. has atomic weapons elsewhere and South Korea is still under the U.S. nuclear umbrella. Seoul has never considered asking the U.S. to move nuclear weapons back into the country, he said.
New satellite images show construction under way at Yongbyon, which, combined with reports from Hecker and another American expert who recently traveled to the atomic complex, appear to show that the North is going forward with its stated plans to build a light-water nuclear power reactor.
Light-water reactors are ostensibly for civilian energy purposes, but such a power plant would give the North a reason to enrich uranium. While light-water reactors are considered less prone to misuse than heavy-water reactors, once the process of uranium enrichment is mastered, it is relatively easy to enrich further to weapons-grade levels.
Experts say the North has yielded enough weaponized plutonium for at least a half dozen atomic bombs.
Hecker said the North Koreans emphasized during his trip that the centrifuge facility was operating; although he couldn't verify that statement, he said "it was not inconsistent with what we saw."