Vadym Skibitskyi, a representative of the Defence Intelligence of Ukraine, noted this in an interview with ITV News TV channel.

"It is possible russia will use nuclear weapons against Ukraine. They will try to stop our offensive activity and to destroy our state. Such actions will pose a threat to other countries.

The blast of a tactical nuclear weapon will have an impact not only in Ukraine but the Black Sea region. We remember the story of Chornobyl. It is possible we will have one more catastrophe on our territory, in the Eastern Europe,” Vadym Skibitskyi said, adding that the fallout from use of a nuclear weapon could affect countries including Poland, Turkey and Bulgaria.