At the end of 2015 the US National Security Archive published a declassified document from 1950s listing nuclear strike targets on the territory of the USSR and its allied countries. It listed 1,200 cities from Eastern Germany in the west to China in the east. Moscow topped the list with Leningrad (St. Petersburg) to follow: there were 179 «designated ground zeros» for atomic bombs in Moscow and 145 in St. Petersburg. The nuclear weapons would have ranged from 1.7 to 9 megatons (for comparison, the bomb dropped on Hiroshima on August 6, 1945, codenamed Little Boy, was roughly 0.013-0.018 megatons).