Beijing had informed Tokyo that it would conduct research activities between Jan. 18 and Feb. 15 in the East China Sea, including an area west of the Amami Islands in Kagoshima Prefecture.
However, the 96-meter Dongfangfong No. 2 was spotted operating about 300 kilometers from the area Beijing said it would visit. The JCG radioed the Chinese vessel and warned it to cease its research and leave the EEZ, but it did not respond, according to the JCG.