Information security is difficult to achieve in a digital age, but the Defense Ministry appears to have a serious problem after another apparent leak of a sensitive document Wednesday, the second in only two months.

During the day's Upper House session, Japanese Communist Party lawmaker Sohei Nihi unveiled what he said were confidential records of meetings between senior U.S. and Japanese military officials at the U.S. Defense Department in Washington, late last year.

The 23-page paper, dated Dec. 24, 2014, allegedly relates the content of discussions between Adm. Katsutoshi Kawano, chief of the Joint Staff of the Self-Defense Forces, and seven top U.S. military leaders, both civilian and uniformed.