What's at stake with Ukraine's Zaporizhzhia nuclear power plant, and how does it compare to Chernobyl?

The capture of Ukraine's Zaporizhzhia nuclear power plant by Russian forces in March immediately sparked fears that the world could face another nuclear disaster on the scale of the Chernobyl explosion almost 40 years ago. The U.S. Embassy in Kyiv was quick to call the shelling of Europe's largest nuclear power plant a "war crime."

"We survived a night that could have stopped the story, the history of Ukraine, the history of Europe," said Ukrainian President Volodymr Zelenskyy. An explosion at Zaporizhzhia would have equaled "six Chernobyls," he said, referring to the Ukrainian nuclear reactor meltdown of 1986 — widely seen as the most catastrophic nuclear disaster in history, with unparalleled health, economic, and environmental impacts.