위안부
Affiliated to the openly revisionist lobby Nippon Kaigi, Ryu was a supporter of right-wing filmmaker Satoru Mizushima's 2007 revisionist film The Truth about Nanjing, which denied that the Nanking Massacre ever occurred, and among the people who signed ‘THE FACTS’, an ad published in the Washington Post on June 14, 2007 in order to protest against United States House of Representatives House Resolution 121, and to deny the existence of sexual slavery for the Imperial military ('Comfort women').