As radiation spread across Europe in April 1986, so did the truth about a political system built on silence. Four decades on, RFI spoke to history and politics professor Oleg Kobtzeff about how the Chernobyl nuclear disaster exposed the USSR's culture of secrecy, and was among the catalysts for its collapse.
On 26 April, 1986, a reactor exploded at the Chernobyl nuclear power plant in what was then the Ukrainian Soviet Socialist Republic, sending a radioactive cloud drifting across Europe. For days, the Soviet Union said nothing.
