Putin podpísal zákon, ktorý mení dátum ukončenia druhej svetovej vojny
Details of a 1957 explosion at the Mayak nuclear facility didn't emerge until decades later.
In 1957, a waste tank exploded at the Mayak nuclear facility in Russia, releasing around 2 million curies of radioactive waste into the air. The explosion exposed at least 22 villages to radiation, and is now considered the world's third-worst nuclear accident, behind Fukushima and Chernobyl.
But details of the incident were sparse until 1992, when government records were declassified after the fall of the Soviet Union. As late as 1982, a US technical report still referred to the disaster as "alleged."
Around 270,000 people were said to be living on the contaminated land, but within two years of the accident, only 11,000 residents had been evacuated.