In the first confirmed entry by Chinese government vessels into the area, two Chinese coast guard ships briefly entered Japanese waters July 17 off Aomori Prefecture, the Japan Coast Guard said.
A patrol vessel operated by the Japan Coast Guard confirmed the entry of the two ships into waters off Cape Henashi in the Sea of Japan from 8:05 a.m. to 8:20 a.m. The two vessels exited at around 9:40 a.m. after being issued a warning by the coast guard.
About two hours later, the two Chinese ships were spotted off Cape Tappi, also in the Sea of Japan, and exited around 3:20 p.m., the coast guard said.
The move follows the entry on July 15 of two Chinese coast guard ships into Japanese waters around two islands off Kyushu, also for the first time in that area.
US Coast Guard photo by Coast Guard Cutter Morgenthau
Also July 17, four Chinese coast guard ships entered Japanese territorial waters around the Senkaku Islands in Okinawa Prefecture, the coast guard said.
According to the Japan Coast Guard's 11th regional headquarters in Naha, the prefectural capital, the four ships — the Haijing 2106, the Haijing 2113, the Haijing 2306 and the Haijing 2308 — were present in Japanese waters at a point north-northwest of Uotsuri, one of the islets, for some 15 minutes from around 10:40 a.m.
The Japanese-administered islands in the East China Sea are claimed by China, where they are known as Diaoyu, and Taiwan.