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This includes tests of high-explosive triggers useful for nuclear weapons, and the redesign of a missile nose-cone to take what looks like a nuclear warhead.
ECONOMIST: Less than meets the eye so far
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America, meanwhile, has again been showing around documents that purport to be Iranian design work on a missile nose-cone of a sort that that could carry a nuclear warhead.
ECONOMIST: Will Russia help, or just get in the way?
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This makes it hard, for instance, to compare real-time video images (from a camera in the nose-cone of a missile, for example) with a set of several thousand targets (pictures of enemy aircraft, say), because all the targets have to be tested within a thirtieth of a second, the duration of a single frame of video.
ECONOMIST: Optical recognition
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Meanwhile documents turned up that showed design work to fit a nuclear-weapon-sized object into the nose-cone of a Shahab missile but Iran dismissed them as forgeries.
ECONOMIST: Diplomacy and Iran