In fact, "since the 1980s, Japan has begun taking increased responsibility for the security of the sea lanes up to 1000 nautical miles from Tokyo Bay," says Parris Chang, a scholar of international security issues and currently a legislator for the Democratic Progressive Party.
「八○年代以來，日本已對從東京灣開始，往南一千海浬的航線加強衛護責任」，民進黨籍立法委員、也是國際戰略學者張旭成說。