Ukrainian President Volodymyr Zelenskyy on Friday accused Russia of attacking the Zaporizhzhia nuclear power plant and demanded immediate sanctions against Russia in a televised address, RIA news agency reported.

He urged world leaders to stop Russia "before this becomes a nuclear disaster" in a Facebook video post. 

"No country besides Russia has ever fired upon an atomic power plant's reactors. The first time, the first time in history," he said, urging European leaders to "wake up now" and stop Russian forces "before this becomes a nuclear disaster."

Russia on Wednesday informed the International Atomic Energy Agency (IAEA) that its forces had taken control of the territory around the Zaporizhzhia nuclear power plant in Ukraine.

IAEA Director-General Rafael Grossi said in a statement that Russian diplomats in Vienna told the IAEA that personnel at the Zaporizhzhia plant, Ukraine's largest nuclear power plant, have continued their work on providing nuclear safety and monitoring radiation in normal mode of operation, and "the radiation levels remain normal." 

The Zaporizhzhia plant has six out of Ukraine's 15 nuclear energy reactors, according to the statement.

Russia and Ukraine agreed to organize humanitarian corridors to evacuate civilians in the second round of talks in Belarus on Thursday.