"Director of the Russian Foreign Intelligence Service Sergey Naryshkin said that information had recently appeared indicating that Kiev may continue to work on the creation of a 'dirty nuclear bomb' — a munition filled with explosives and radioactive substances, the explosion of which leads to radiation contamination of a vast territory," the service's statement read.
Naryshkin also noted that the possible use of such a weapon would have severe consequences for the life and health of the entire population and ecosystems of Eastern Europe.
The official added that Moscow has information that Kiev decided to send a batch of fuel for reprocessing.
"Information [has been] received by the Russian Foreign Intelligence Service about the decision of the Ukrainian State Nuclear Regulatory Inspectorate to send for reprocessing from the Rivne nuclear power plant a batch of irradiated fuel, which contains a large amount of highly radioactive materials," Naryshkin said.
Kiev has transferred the fuel under the pretext of its disposal in two shipping containers to the site of the centralized storage facility for spent nuclear fuel in the city of Chernobyl, Naryshkin added.
"Kiev did not even notify the IAEA of such work, violating safeguard agreements with it," the intilligence service head said.
In early June, the Federal Security Service of Russia stated that the Ukrainian military intelligence service was plotting to carry out a terrorist attack in Russia using a "dirty bomb".
The statement said that Ukraine intended to deliver and plant "dirty bombs" loaded with delay timers to simultaneously detonate and render the area uninhabitable.
Earlier, Russian State Duma Speaker Vyacheslav Volodin accused the United States and its Western allies of prolonging the conflict in Ukraine by supplying ammunition with depleted uranium to Kiev. The official also expressed concern about the possibility of Kiev using a dirty bomb or even "tactical nuclear weapons" in the future.