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)

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