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Officers of Japan’s Maritime Self-Defence Force at the Yokosuka base, Kanagawa

Japan’s Coast Guard and Maritime Self-Defense Force: Cooperation among Siblings Analysis, Maritime Awareness Project

Coping with “gray zone” situations has in recent years become the core security challenge for Japan. Since September 2012, Beijing has been challenging Japan’s sovereign control of the Senkaku Islands by regularly sending law-enforcement vessels into Japanese territorial waters and contiguous zones.


Beijing sends civilian or paramilitary forces to change facts on the ground while daring the targeted country to use force to stop these activities. These incursions, which do not amount to an armed attack, are blurring the line between crime and defense, law enforcement, and military activities.

In August, an armada of 230 Chinese fishing boats, accompanied by 7 Chinese Coast Guard (CCG) vessels, was spotted near the Senkakus. This could have led to a nightmare scenario for Tokyo in which the disputed islands are seized by Chinese armed fishermen. Such a situation could quickly escalate with the arrest of the intruders at sea by the Japan Coast Guard (JCG) or on land by the police forces, followed by the deployment of Chinese naval vessels to rescue its citizens. The Japan Maritime Self-Defense Forces (JMSDF) could then be deployed on site, on the request of the Cabinet Office, only with limited authorization to use force (law-enforcement powers). This chain of events would create a tense standoff between JMSDF and Chinese naval vessels with a high risk of developing into a military incident. The dilemma for Japan would be to choose between being the first side to use force to displace the intruders and leaving them alone with the risk of Beijing claiming actual control of the islands. In this kind of scenario, a clear division of roles between the JCG and JMSDF, with the early involvement of the latter, would ensure a greater deterrence effect and a swifter and consistent response in case of an intrusion.

Read the full article here

This MAP Analysis is a preview of the author’s forthcoming article in the January issue of Asia Policy.


Japan’s Coast Guard and Maritime Self-Defense Force: Cooperation among Siblings
maritime security Regional Security Asia Japan