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STORY: Russia seized Europe's largest nuclear power plant in March after invading Ukraine on Feb. 24. The plant is still run by its Ukrainian technicians. Ukraine's Energoatom said the area was struck five times on Thursday, including near the site where radioactive materials are stored.

Grossi said that he was ready to lead an IAEA mission to Zaporizhzhia and called on Russia and Ukraine to cooperate so the inspectors could travel as soon as possible.

Russia's U.N. Ambassador Vassily Nebenzia said the trip agreed between Russia and the IAEA in June was cancelled by U.N. security officials.

"We believe it justified for IAEA representatives to go to the Zaporizhzhia nuclear power plant as quickly as possible and possibly even before the end of August," Nebenzia told the Security Council.