He observed the assembly work and reported back to Soviet leader Joseph Stalin. At 2 am on August 29, 1949 the assembled bomb was wheeled to the tower. The blast was scheduled for 6 am.

In a remote forest, a few kilometres from the Chernobyl power plant, the huge Duga-2 radar tower stands as relic of Soviet mismanagement. Video by Adrian Hartrick and Dominika Ozynska Follow BBC ...

Officials from the Russian Embassy offer flowers at the Liberation Tower, honoring the former Soviet war dead, in Pyongyang ...