Former Japanese Prime Minister Naoto Kan bows to the altar during the national memorial service for the victims of the March 11, 2011, earthquake and tsunami in Tokyo, Japan on Sunday, March 11, 2012.  (AP Photo/Japan POOL)

Former Japanese Prime Minister Naoto Kan bows to the altar during the national memorial service for the victims of the March 11, 2011, earthquake and tsunami in Tokyo, Japan on Sunday, March 11, 2012. (AP Photo/Japan POOL)