The U.N.'s nuclear watchdog on Thursday reported powerful explosions near Ukraine's Russian-occupied Zaporizhzhia nuclear power station and renewed calls for a security zone around the plant.

A Russian official dismissed the comments by Rafael Grossi, head of the International Atomic Energy Agency (IAEA), saying they suggested Moscow could not uphold nuclear safety.

Ukrainian forces are storing Western-supplied missiles and artillery shells in nuclear power plants, Russian Foreign Intelligence Service Director Sergey Naryshkin said on Monday. He claimed that Kiev has been using the plants as cover for ammunition stockpiles.

Pacific Island nations have urged Japan to delay the release of wastewater from the Fukushima nuclear power plant over fears it could contaminate fishing grounds.