An Unknown Black Marketeer from Russia May Have The Fuel for a Nuclear Bomb

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 September 1, 2015. The most powerful nuclear weapon ever detonated was first tested on October 30, 1961, having 50 megatons of TNT equivalent. AFP PHOTO / ALEXANDER NEMENOV

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.