还有一个原因,The treaty was up for renewal in 1970. However, in the years preceding renewal, Japanese officials began to pressure the United States to return the Ryukyu Islands to Japan. The possibility that the Japanese might not renew the Security Treaty if the reversion was not addressed gave Tokyo additional leverage and made the Ryukyu Islands a pressing issue for Washington. 不还冲绳,日本将可能不续约美日安保条约,且要求全部核武撤离日本包括冲绳