Norilsk oil spill
Russian President Vladimir Putin declares a state of emergency after 20,000 tons of oil leaked into the Ambarnaya River near the Siberian city of Norilsk within the Arctic Circle on May 26, 2020. The spill happened when a fuel tank in a Nornickel NTEK power plant collapsed. Putin lambasted the company for not reporting the incident. The World Wildlife Fund said the accident is believed to be the second-largest in modern Russian history.
Sources: BBC News The Guardian