US Secret Security Information on Takeshima 1953年（昭和28年）12月09日 ダレス国務長官の書簡

It is reported that US Secretary of State Dulles had repeatedly threatened Japan over territorial issues while Japan was trying to straighten out the entangled territorial issues intentionally created by U.S. government, thereby keeping those irritants effectively damaging to Japan's relations with China, Taiwan, ROK, and the Soviet Union (now Russia).