What are the safety risks at Ukraine’s nuclear power plants?

Chernobyl and Zaporizhzhia nuclear power stations in Ukraine have been captured by Russian forces – do they know what they’re doing with them?

photo of a large silver building with a round roof, next to a river, an older building, and power lines
The New Safe Confinement contains the old sarcophagus at Chernobyl, enclosing the remains of Reactor 4, which exploded in 1986. Credit: German Meyer / Getty Images