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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Andrew Krepinevich, a radical defence analyst whose thinking has been endorsed, in part, by Mr Rumsfeld, cites several weapon systems which deserve higher priority: long-range bombers, missiles and unmanned aircraft, ships designed for coastal warfare, and submarines which can fire cruise missiles.

ECONOMIST: Defence policy

The Cornwall carries a 4.5 inch MK8 gun, Goal Keeper CIWS close in weapon systems, Sea Wolf anti-missile system, Harpoon missile launchers, two 20mm close range guns, Lynx MK8 helicopter armament, anti-ship missiles, and one of the most sophisticated command and control communications systems on water.

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We have this incredibly powerful alliance that is multidimensional and involves a whole range of coordination, training activities, making sure that there's interoperability with respect to various weapon systems and our defensive capabilities.

WHITEHOUSE: President Obama and President Lee Hold a News Conference