Do the United States and its allies really have the technology to stop incoming missiles from North Korea?In the week North Korea tested another ballistic missile - this time it flew over northern Japan - David Aaronovich asks what threat does North Korea's missile programme pose? And beyond North Korea, what are the capabilities of ICBMs? And how effective are missile defence systems? Contributors:Sir Lawrence Freedman, Emeritus Professor of War Studies at Kings College LondonJoseph Cirincione author of Nuclear Nightmares: Securing the World Before It Is Too LateDr Patricia Lewis, a former UN official who specialised in non-proliferationDr Laura Grego from the Union of Concerned Scientists.

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