Hirokazu Matsuno, the chief of the Japanese cabinet official house, said on Monday (5th) that Japan protested to Russia to oppose that in Japan claiming to have sovereignty, but on an island controlled by RussiaFollow the Russian and Chinese warships outside the coast of northern Japan.

According to the Voice of America and the Associated Press, Matsno Boyi criticized Russia to hold exercises in two of the four controversial islands.Japan calls these islands as the northern territory, and these islands are located on the Qiandao Islands of Hokkaido, the northernmost islands in Japan.It is unclear whether China will participate in the controversial islands.

Japan has repeatedly sought sovereignty over to obtain controversial islands.In the last days of the Second World War, these islands were captured and occupied by Moscow.

Matsuno said that the Japanese Defense Provincial province discovered six Russian and Chinese warships on Saturday, about 190 kilometers west (118 miles) west of Shenwei Hokkaido, and fired the cannon to Japan.

Matsuno said at a press conference: "Japan will continue to seriously concern and monitor the movements of these vessels, and will take all possible measures to conduct early warning and surveillance activities in the waters of surrounding Japan."

The Chinese Ministry of National Defense Sunday (September 4) introduced in a statement that as part of the exercise, China participated in the air, ground and maritime exercises.The Chinese Navy tactical team conducted a joint exercise with Russia in the Sea of Japan, including an exercise aimed at destroying rafting mines.

After the joint shooting exercises, including a Chinese missile destroyer, a frigates and a supply ship, and a warship, including the three Russian frigates, crossed the Sects Strait between the Island and Hokkaido in Japan.EssenceAccording to the Ministry of Defense of China, the Chinese warship traveled through the Malaysian Strait on August 29.

After Russia invaded Ukraine, Japan expressed concern about Asian tensions. It is currently amending its national security strategy and national defense guidelines to vigorously enhance military capabilities to consolidate deterrent capabilities.