CHISHINAU, Moldova - The sample of highly-enriched uranium, of a type that could be used in a nuclear bomb, arrived here on a rainy summer day four years ago, in a blue shopping bag carried by a former policeman.
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A mockup of a Soviet AN-602 hydrogen bomb (Tsar Bomb) is displayed at the exhibition devoted to the 70th anniversary of Russia's nuclear industry in Moscow on Sept. 1, 2015.