Russia's nuclear chief says Japan exaggerating nuclear crisis Wed Apr 13, 2011 11:29am GMT SANYA, April 13 (Reuters) - Japanese authorities are exaggerating the scope of the country's nuclear disaster to give insurance companies an out, Russia's nuclear chief said on Wednesday. "It is hard for me to assess why the Japanese colleagues have taken this decision. I suspect, this is more of a financial issue, than a nuclear one," Sergei Kiriyenko said on the sidelines of a bilateral meeting between the Russian president and Indian prime minister ahead of a meeting of major developing economies in southern China.