LVIV, Ukraine (Reuters) - Radioactive substances could be released from Ukraine's Chernobyl nuclear power plant because it cannot cool spent nuclear fuel after its power connection was severed, Ukraine’s state-run nuclear company Energoatom said on Wednesday.

       Work to repair the connection and restore power to the plant, which has been occupied by Russian troops, has not been possible because fighting is under way, it said.

       (Reporting by Natalia Zinets, Writing by Alessandra Prentice, Editing by Timothy Heritage)