The Chernobyl nuclear power plant has been captured by Russian forces, an adviser to the Ukrainian presidential office, Mykhailo Podolyak, said on Thursday.
"It is impossible to say the Chernobyl nuclear power plant is safe after a totally pointless attack by the Russians," he said.
"This is one of the most serious threats in Europe today," Podolyak said.
(Reporting by Natalia Zinets, writing by Maria Tsvetkova; Editing by Hugh Lawson)
