>… Japan had adopted the three non-nuclear principles amidst mounting public pressure … a year later, the Japanese government violated its own non-nuclear principles by giving blanket approval for the passage and port calls of all US Navy warships without first determining whether they carried nuclear weapons; a fact that the previous LDP government had denied.
… The documents on this secret deal were in fact declassified for the public in 1999, and a researcher from a private institute in Washington even made a copy of it, before it was reclassified on security grounds. Japan’s leading newspaper Asahi claimed to have procured a copy of the document and reported about it in August 2001, opening a Pandora’s Box in Japanese political circles.
… that the DPJ government is keeping its option open to switch to a “2.5 principle” in the event of a security crisis during which it may allow US nuclear armed vessels to drop anchor at Japanese ports.