A Chinese survey ship was spotted within Japan¡¯s exclusive economic zone off Amami Oshima Island in Kagoshima Prefecture on Sunday, according to the Japan Coast Guard.

The JCG¡¯s 10th Regional Coast Guard Headquarters, based in the city of Kagoshima, said the same day that a patrol ship found the Chinese vessel releasing what appeared to be a wire into the sea about 380 kilometers west of the island at around 6:15 a.m.

The patrol ship¡¯s crew urged the Chinese vessel by radio to stop its activity, saying that marine research without Japan¡¯s consent is not permitted.

At around 9:45 a.m., the Chinese ship crossed the geographical equidistance line between Japan and China to the west and left the EEZ, the regional headquarters said.