Ministry viewed nukes entry into Japan as effective deterrent in 1960s

TOKYO, Japan - Diplomatic documents totaling 8,100 pages are unveiled to the media at the Diplomatic Record Office of the Foreign Ministry in Tokyo on July 7, 2010. The documents consist of eight files concerning the revision of the Japan-U.S. security treaty in 1960 and 29 files concerning the reversion of U.S.-occupied Okinawa to Japan in 1972.