The International Atomic Energy Agency says it’s placing inspectors at all four of Ukraine’s nuclear power plants in order to safeguard against a nuclear catastrophe brought on by Russia’s invasion. On Wednesday, IAEA Director General Rafael Grossi toured the Chernobyl nuclear power plant, which Russia briefly occupied last year.

Rafael Grossi: “We certainly hope that there will not be any further occupation or attack on the plant. My efforts are aimed at avoiding that. And by having a permanent presence of the IAEA, we are taking a very concrete step in that direction.”

The IAEA is continuing to call for the establishment of a nuclear protection zone around the Russian-occupied Zaporizhzhia nuclear power plant, which has repeatedly come under fire over the past 11 months of fighting.