The following is a machine translation of a Yomiuri news story:
The government is considering introducing an “active cyber defense” system to detect signs of an attack and identify the source of the attack in order to strengthen defense against cyber attacks on critical infrastructure such as communications and electricity. Adjustments will be made in the direction of incorporating the policy into the national security Strategy to be revised by the end of the year.
Several government officials have revealed. Proactive cyber defense is the constant patrolling of cyberspace to quickly identify and address suspicious communications and behavior that could pose a security threat. It is said that the United States and the United Kingdom have already adopted it.
Read more at Yomiuri.