Analysts say North Korea is years away from being able to accurately deliver a nuclear weapon atop a long-range missile.

CNN: March 17, 2013 -- Updated 1952 GMT (0352 HKT)

The US and North Korea's neighbours fear Pyongyang's ultimate goal is to put a nuclear warhead on a long-range missile that could target the west coast of the US, but it is not believed to have mastered the technology yet.

BBC: North Korea in nuclear warning after UN rocket resolution