
A defiant North Korea is threatening both the United States and South Korea in response to the United Nations decision to invoke additional sanctions on Pyongyang for it's rocket launch late last year.
Calling the U.S. a sworn enemy of North Korea, the government of Kim Jong Un vowed to launch more missiles and conduct a nuclear test.
Pentagon correspondent Barbara Starr looks into how dangerous the North's nuclear capability really is.

By Pam Benson
Satellite imagery of a North Korean nuclear test site identifies what could be key installations that would likely play a prominent role if Kim Jong Un orders a test, which the government threatened to do on Thursday.
The analysis of the Pung-gye-Ri Nuclear Test site by U.S.-Korea Institute at Johns Hopkins University’s 38 North blog shows recently completed structures essential to an underground nuclear weapons test.
One is believed to be a command and control bunker. Another photo shows what appears to be a radio relay system that zigzags through a valley, which the 38North analysts believe could be used as part of a communications system linking the bunker to the North Korean leadership in Pyongyang.
Why sticks won't work with North Korea
"Located about 150 meters (164 yards) north of the test tunnel entrance, the bunker, used only when a test is about to be conducted, would contain equipment for controlling the nuclear device, managing instruments for gathering test data and communicating with authorities in Pyongyang," the report stated. "The bunker would also provide shelter for all personnel in the area."
By Dugald McConnell and Brian Todd
Residents of Washington may be surprised by a helicopter flying low overhead this week, endlessly prowling the city to map its radiation signature.
The helicopter is crisscrossing the city, like a lawn mower covering a lawn, flying as low as just 150 feet off the ground. CNN spotted it northwest of downtown on Monday, flying low over the buildings, back and forth, east to west.
The purpose: to produce a baseline scan of the natural radiological readings in the capital. Once the map is done, any new anomalies - or suspicious radioactive activity - could be more easily detected.
Behind every Hellfire missile, there's an actual human being remotely pulling the trigger. But the Pentagon is preparing for the day when robots are capable of targeting and launching a strike on their own.
CNN's Chris Lawrence reports on the Pentagon's new rules on drones, effectively forbidding the development of lethal weapons with no human control.
By Jamie Crawford with reporting from Jill Dougherty, Elise Labott and Pam Benson
The United States is closely watching how rebel forces operate inside Syria, and what their end objectives might be as the Obama administration weighs whether or not to provide arms to the Syrian opposition.
"Will providing arms to the opposition convince the people who support [Syrian President] Bashar al-Assad, in many cases because they are afraid of their own existence, or will it simply lead to more fighting - that is the question that we are considering," Robert Ford, the U.S. ambassador to Syria, said during a panel discussion in Washington on Thursday on the crisis in Syria.
"Arms are not a strategy, arms are a tactic," Ford said about the deliberation the administration is undertaking on the question, and that a "military solution" is not the best path forward for Syria.
"The president has never taken the provision of arms off the table," he said. "And so, as we think about our policy of sending arms or not, and today we do not, we want to make sure that tactic plays into and helps us achieve a strategy of enabling the Syrian people to reach a political solution."

By Pam Benson
Recent satellite photos show continued activity at a controversial Iranian military site that international weapons inspectors have repeatedly been denied access to, according to a Washington-based think tank.
The Institute for Science and International Study obtained imagery from DigitalGlobe taken on November 7 that the institute says shows changes in the roofs on two key buildings at the Parchin Military Complex. ISIS also pointed out there is a new addition on the building suspected of containing a high-explosives chamber and piles of dirt not seen in an image taken on September 19.
ISIS said the imagery indicates additional changes will be made to the site, making it more difficult for the international inspectors.
"The considerable amount of new materials, equipment, and rows of earth piles suggest that further construction will be taking place, thus increasing the level of alteration and further degrading the chance of obtaining reliable environmental samples if and when (International Atomic Energy Agency) inspectors gain access to the site," ISIS stated.
Since January, the IAEA has been seeking access to the site, where it suspects Iran may have conducted high-explosives tests related to the development of nuclear weapons. Iran denies that Parchin has any role in its nuclear program.
The latest IAEA report on Iran released earlier this month said the "extensive activities" at the Parchin site are certain to have "seriously undermined" the agency's verification process.
Those activities include "significant ground scraping and landscaping" with new dirt roads.

