Chornobyl disaster occurred in the early hours of April 26, 1986, in Soviet Ukraine. Nearly 39 years after the worst nuclear disaster in history, Russia’s brazen attack on the $2 billion New Safe Confinement poses a new potential radioactive danger.
According to Google AI that’s why sunflowers are planted in Ukraine:
Sunflowers are used in a process called phytoremediation to help clean up radioactive waste, particularly after nuclear accidents like Chernobyl and Fukushima. They are effective at extracting radioactive metals like cesium-137 and strontium-90 from the soil and water, concentrating these isotopes in their biomass. After the sunflowers have done their job, they are disposed of as radioactive waste.