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Japan's plutonium stockpiles raise specter of nuclear security, de facto deterrence

Pressure is mounting on Japan to explain itself regarding its considerable stockpiles of nuclear materials that could be weaponized and threaten the safety of the global community, against a backdrop of rising tensions in the region and a worldwide threat of increasing terrorism.

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Japan ships weapons-grade plutonium to U.S., Three Non-Nuclear Principles in focus

A ship carrying 331 kilograms of weapons-grade plutonium left a port in Ibaraki Prefecture, eastern Japan, on Tuesday en route to the United States.