
FILE - Firefighters visit Mitinskoye Cemetery in Moscow, Russia, on Thursday, April 26, 2012, to honor those who died responding to the explosion and fire at the Chernobyl nuclear power plant on April 26, 1986. (AP Photo/Ivan Sekretarev, File)

FILE - Firefighters visit Mitinskoye Cemetery in Moscow, Russia, on Thursday, April 26, 2012, to honor those who died responding to the explosion and fire at the Chernobyl nuclear power plant on April 26, 1986. (AP Photo/Ivan Sekretarev, File)