North Korean leader Kim Jong Un, center, poses with chiefs of branch social security stations in this undated picture released by North Korea's official news agency on November 27, 2012. North Korea said Thursday that it plans to carry out a new nuclear test and more long-range rocket launches, all of which it said are a part of a new phase of confrontation with the United States.
Kim celebrates with staff from the satellite control center in Pyongyang, North Korea, during the launch of a rocket carrying a satellite, in a photo released by the official North Korean news agency on December 12.
A crowd watches as statues of the nation's founder, Kim Il Sung, and his son Kim Jong Il are unveiled during a ceremony in Pyongyang on April 13, 2012. Photos from North Korea are rare, but the country was on full display in April 2012 as it celebrated the 100th birthday of Kim Il Sung.
A North Korean soldier stands guard in front of an Unha-3 rocket at the Tangachai-ri Space Center on April 8, 2012.
A military vehicle participates in a parade in Pyongyang on April 15, 2012.
North Koreans wave flags in front of portraits of Kim Il Sung, left, and his son Kim Jong Il during celebrations to mark the 100th birth anniversary of Kim Il Sung in Pyongyang on April 16, 2012.
North Korean soldiers relax at the end of an official ceremony attended by leader Kim Jong Un at a stadium in Pyongyang on April 14, 2012.
Kim Jong Un applauds as he watches a military parade in Pyongyang on April 15, 2012.
A North Korean soldier stands on a balcony in Pyongyang on April 16, 2012.
North Korean soldiers march during a military parade in Pyongyang on April 15, 2012.
Soldiers board a bus outside a theater in Pyongyang on April 16, 2012.
North Korean performers sit below a screen showing images of leader Kim Jong Un in Pyongyang on April 16, 2012.
North Korean soldiers salute during a military parade in Pyongyang on April 15, 2012.
Kim Jong Un visits the Rungna People's Pleasure Ground, which is under construction in Pyongyang, in a photo released on July 3, 2012, by North Korea's official Korean Central News Agency.
North Korean soldiers listen to a speech during an official ceremony attended by leader Kim Jong Un at a stadium in Pyongyang on April 14, 2012.
Members of a North Korean military band gather following an official ceremony at the Kim Il Sung stadium in Pyongyang on April 14, 2012.
North Korean military personnel watch a performance in Pyongyang on April 16, 2012.
A North Korean controller is seen along the railway line between Pyongyang and North Pyongan province on April 8, 2012.
A North Korean military honor guard stands at attention at Pyongyang's airport during a diplomatic visit on May 2, 2001.
- North Korea has warned that it plans to carry out underground nuclear tests
- Would be the third nuclear test Pyongyang has carried out since 2006
- Comes after new U.N. sanctions for North Korea's December satellite launch
- Experts say its unknown how close the North is to being able to launch a nuclear warhead
(CNN) -- North Korea's intention to carry out a new nuclear test, coming on the heels of December's successful satellite launch, suggests that Pyongyang is moving forward toward developing a nuclear warhead and a deliverable missile system, experts say. The question remains: How close are they?
The answer, like the cloistered "hermit kingdom," remains largely a mystery as does much of its nuclear program.
"It's a question over the delivery system and the reliability of those systems," said Daniel Pinkston, senior analyst for the International Crisis Group covering Northeast Asia. "That is essentially unknown, or known by a few people inside North Korea."
A 2009 report by International Crisis Group suspects that North Korea "probably has somewhere between six and twelve nuclear weapons, or at least explosive devices," but notes that experts are divided whether any of these to be now useable as warheads -- small enough to be mounted on missiles and durable enough to withstand the hazards of flight.
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"It's pretty clear that these are advanced technologies and the systems present a number of engineering challenges -- and to master these technologies requires a number of tests," Pinkston said.
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Last month, on the first anniversary of Kim Jong Il's death, North Korea successfully launched a three-stage rocket that put the satellite, Shining Star-3, into orbit. The launch also signaled that the North's long-range missile program now puts the United States within reach.
Last week, the United Nations Security Council unanimously passed a resolution that strengthened sanctions against the north in response to the December rocket launch. Declaring sanctions to be tantamount to "a declaration of war," North Korea is threatening further missile and nuclear tests which it said are a new phase of confrontation with the United States.
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A new underground nuclear test would be the third, following tests in 2009 and 2006. While seismographs will be able to confirm if North Korea has an underground test, the size of the nuclear blast will be difficult to determine, Pinkston said.
"From what I understand it is virtually impossible to mask a nuclear event in terms of concealing it due to seismographs," Pinkston said. "But as far as the accuracy of the assessment of the yield, that's where the difficulty lies."
Estimates of the size, or "yield," of the 2009 nuclear test range from 2.5 kilotons to 6 kilotons, Pinkston said. By comparison, the atomic bomb dropped on Hiroshima had a yield of 16 kilotons.
While the specter of a North Korea able to send nuclear-tipped missiles is worrisome, equally troublesome to the international community is Pyongyang's atomic technology fuelling the black market for weapons.
"If its clandestine uranium-enrichment program has made strides, Pyongyang could demonstrate that it will gain access to a far larger pool of fissile material than simply its limited supply of weapons-grade plutonium," wrote Patrick M. Cronin, an Asian expert at the Center for New American Security, in a CNN op-ed. "A larger pool of fissile material is a dual threat: As a vital part of an expanded nuclear weapon program and as a commodity to be sold on the black market."
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