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)

And we will continue to instruct our teams that they work closely together to ensure what is the ultimate outcome -- which is not any particular weapon system or any particular missile range, but rather can we protect our people, can we make sure that the objectives of the alliance are achieved.

WHITEHOUSE: President Obama and President Lee Hold a News Conference

Each weapon has its own set of moves, its range, its modifiers.

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