Tokyo:Japan expressed concern Monday after China and Russia held a joint naval exercise in which 10 of their warships passed through international waterways between its northern and southern islands.
The Chinese and Russian vessels were first spotted last Monday passing through the Tsugaru Strait between Japan's main island of Honshu and the northern island of Hokkaido. They passed through the Osumi Strait off the southern island of Kyushu on Thursday, completing a near circle around Japan's main island before heading back toward China.
Yoshihiko Isozaki, the deputy chief Cabinet secretary, said at a regular briefing that it was the first time Japan has confirmed that Chinese and Russian naval vessels passed jointly through the Tsugaru and Osumi Straits and in waters near the Izu islands off the main island's southeastern coast.
The straits are considered international waters. Japanese officials said the Chinese and Russian ships did not enter Japanese territorial waters.