美日安保條約
Although the United States and Japan have been strong allies since the end of World War II, the accident involving "Ehime Maru" showed that the relationship is not always completely harmonious, especially with regard to incidents in which U.S. military personnel or assets injure or kill Japanese citizens or damage their property. In response to crimes committed by U.S. servicemembers against Japanese citizens, such as the 1995 Okinawan rape incident, Japanese citizens and some Japanese government officials have questioned the equality of the Treaty of Mutual Cooperation and Security between the United States and Japan and the issue of responsibility and accountability by the U.S. government concerning the actions of its military members in Japan. In addition, the Japanese have questioned the U.S. commitment to safe operations of its military assets in light of several accidents, including aircraft crashes and other ship collisions that have injured or killed Japanese citizens.