A senior Defense Agency official indicated Friday that Japan will pursue a redefinition of the Japan-U.S. security arrangement when the two countries discuss the proposed realignment of U.S. forces in Japan.

"While a basic policy on the reorganization is being considered, a new Japan-U.S. security arrangement should be discussed," said the official, who asked not to be identified.

The redefinition should take into account new threats, including terrorism and the proliferation of weapons of mass destruction, he said.