FROM CNN WIRES:
Hong Kong (CNN) - North Korea said Tuesday that it had conducted a new, more powerful underground nuclear test using more sophisticated technology, jolting the already fragile security situation in Northeast Asia and drawing condemnation from around the globe.
It is the first nuclear test carried out under the North's young leader, Kim Jong Un, who appears to be sticking closely to his father's policy of building up the isolated state's military deterrent to keep its foes at bay, shrugging off the resulting international condemnation and sanctions.
The test was designed "to defend the country's security and sovereignty in the face of the ferocious hostile act of the U.S.," the North's state-run Korean Central News Agency (KCNA) said, referring to new U.S.-led sanctions on Pyongyang in the wake of a recent long-range rocket launch.
This morning on "Early Start," CNN's Anna Coren explains what this could mean for North Korea's nuclear ambitions.
READ MORE: North Korea says it conducted new, more powerful nuclear test
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