Ukrainian President Volodymyr Zelensky on Tuesday told his French counterpart Emmanuel Macron that Russia was planning "dangerous provocations" at the Moscow-occupied Zaporizhzhia nuclear power plant.
His statement came after Kyiv and Moscow traded accusations of preparing an incident at the plant, which is Europe's largest.
"I warned Emmanuel Macron that the occupation troops are preparing dangerous provocations at the Zaporizhzhia plant," Zelensky said in a statement after a phone call with his French counterpart.
"We agreed to keep the situation under maximum control together with the IAEA (International Atomic Energy Agency)," he added.
In his evening address, Zelensky said Russia had "installed objects similar to explosives" on the plant, according to Ukrainian intelligence.
"Perhaps to simulate the hit on the plant. Maybe they have some other scenario. But in any case, the world sees it," the Ukrainian leader said.
"Radiation is a threat to everyone in the world."
It claimed that "external objects similar to explosive devices were placed on the outer roof of the third and fourth reactors" at the site.
"Their detonation should not damage power units, but may create a picture of shelling from the Ukrainian side," it said, alleging that Moscow would "misinform on this".
In Moscow, an advisor to Russia's Rosatom nuclear agency, Renat Karchaa, accused Kyiv of planning an attack on the plant.
"Today, we got information that I am authorised to announce... On July 5, literally at night, in the dark, the Ukrainian army will try to attack the Zaporizhzhia nuclear power plant," Karchaa told Russian state television.
He claimed that Ukraine planned to use "high-precision, long-range weapons" as well as drones.
Russia and Ukraine have regularly accused each other of putting the plant's safety at risk since the outbreak of the war in February 2022.