In 1972, Japan regained administrative control of the Senkaku Islands following years of negotiations with the United States after World War II. However, the People’s Republic of China (PRC) and the Republic of China already had made claims to these islands. The United States chose not to weigh in on the Senkakus’ sovereignty, leading to the tensions that have resurfaced today as the PRC asserts its dominance in the East China Sea and beyond.
Watts, Robert C. IV
"Origins of a “Ragged Edge”—U.S. Ambiguity on the Senkakus’ Sovereignty,"
Naval War College Review: Vol. 72
, Article 8.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol72/iss3/8