Japan's defense province released on Tuesday that a fleet consisting of 10 ships of China and Russia drove across the narrow strait between Benshuka Island and Hokkaido on Monday.

According to Reuters, Japan has always paid close attention to military exercises in the region.This time, the Japanese side confirmed that the Sino -Russian ship formation acted across the Tsugai Strait.A spokesman for the Japanese Ministry of Defense said: "There is no situation of violations of the territorial sea, and there is no violation of international rules."

The Jinqing Strait belongs to the international waters and is open to foreign ships including warships.

The China -Russia and Japan's Maritime Maritime Military Show is part of the two navy in cooperation between the two navy from October 14th to 17th. The battleships and support vessels of the Russian Pacific Fleet participated in the exercise.

Reuters reports that in recent years, the relationship between Moscow and Beijing and the West has deteriorated, and the two countries have strengthened military and diplomatic connections.