FILE - Lyudmilla Ignatenko, right, the widow of firefighter Vasily Ignatenko, mourns at his grave at Mitinskoye Cemetery in Moscow, Russia, on Thursday, April 26, 2001, the 15th anniversary of the explosion and fire at the Chernobyl nuclear power plant in Ukraine. With her at the cemetery is her son, who was not identified. (AP Photo/Alexander Zemlianichenko, File)