 Russia's FSB security service said on June 23 it had detained five people who were trying to buy one kilogram of radioactive cesium-137 for $3.5 million on behalf of a citizen of Ukraine, Russian state-owned TV channel Rossiya24 reported. The FSB was cited as saying that the cesium-137 was meant to be taken out of Russia to be used to stage an incident with purported weapons of mass destruction aimed at discrediting Russia. Ukrainian President Volodymyr Zelensky said this week that Ukrainian spies had received information showing Russia was considering carrying out a terrorist attack at the Russian-controlled Zaporizhya nuclear plant in southern Ukraine involving a release of radiation.