In the early 2000s, a U.S. military crisis in Afghanistan led to an unexpected solution: hiring a Russian Mi-26 to rescue downed Chinooks. This raised the question—how did the Soviet Union create the ...

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 ...