USSR Centenary

FILE - This photo shows an aerial view of the Chernobyl nuclear plant in Chernobyl showing damage from an explosion and fire in reactor four on April 26, 1986 that sent large amounts of radioactive material into the atmosphere in Ukraine. Gorbachev's esteem in the West was undermined when a reactor at the Chernobyl nuclear power plant exploded in 1986, spewing a cloud of radioactive fallout over much of Europe for a week before the fire could be put out. Despite Gorbachev's advocacy of glasnost, the Soviets did not inform the outside world of the disaster for two days. (AP Photo/Volodymyr Repik, File) FILE PHOTO

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