You're reading: BBC: Ukraine leaks Stalin’s ‘KGB secrets’

Ukraine's SBU security service has published "top secret", Stalin-era files that Russia does not want to release. The SBU chief archivist, Ihor Kulyk, says his colleagues recently read on Facebook that - at the request of Russia's FSB security service - a court in Moscow denied Russian historian Sergei Prudovsky access to look at a cache of documents dealing with Japan's efforts to recruit right-wing Russian emigres as spies.

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