Russia has occupied the massive Zaporizhzhia nuclear power plant, which sits roughly 50 miles from the front lines. Ukraine's other reactors are also operating in a volatile war zone.
Zelenskyy made the alarming claim in his nightly video address, adding that he believes the Russians may soon damage the Zaporizhzhia nuclear power plant and blame Ukraine.
The Zaporizhzhia Nuclear Power Plant used a large reservoir for cooling water. Now that reservoir is rapidly draining.
Catch up on key developments and the latest in-depth coverage of Russia's invasion of Ukraine.
The Zaporizhzhia Nuclear Power Station was among the Ukrainian structures damaged by a barrage of Russian missiles on Wednesday. Though power has been restored, the threat of nuclear meltdown remains.
Ukrainian officials say at least six people were killed in Lviv and other cities in a Russian bombardment that included advanced Kinzhal missiles, which air defenses can't shoot down.
Satellite data show water levels plummeting at the Kakhovka Reservoir. The reservoir supplies drinking water, irrigates vast tracts of farmland, and cools Europe's largest nuclear plant.
International atomic experts have warned of a potential nuclear disaster with Ukraine's Zaporizhzhia plant in the middle of a war zone, bringing back terrifying memories of Chernobyl.
Russian forces seized the director-general of the Zaporizhzhia Nuclear Power Plant on Friday, Ukrainian state nuclear company Energoatom said.
Europe's largest nuclear plant will remain shut down until Russian forces leave, the head of Ukraine's atomic energy agency tells NPR. Under Russian occupation, he says, "staff cannot operate freely."
Enerhodar Mayor Dmytro Orlov speaks to NPR about the risks of attacks and nuclear disaster with Ukraine's Zaporizhzhia plant under Russian occupation.