Jan. 30 (UPI) -- While Russia and Ukraine continue targeting each other's energy infrastructure amid their war, the International Atomic Energy Agency leader said backup systems are critical for ensuring safety.

IAEA Director General Rafael Grossi on Friday told the agency's board of governors the war in Ukraine is nearing its fifth year and poses the world's greatest risk for a nuclear accident.

Ukraine has 15 nuclear reactors that generate about half of the nation's electricity, and Russia has 36 operable reactors that generate up to 20% of its electricity, according to the World Nuclear Association.

The number of reactors in the two warring nations highlights the need for backup systems in those nations and all others that contain nuclear reactors to prevent accidents and ensure reliable off-site power, Grossi said.

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