The article analyzes how a defender determines a balance between protecting an object passively and striking preventively against an attacker seeking to destroy the object. With no preventive strike the defender allocates its entire resource to passive protection. If the defender strikes
preventively, the attacker's survivability depends on its protection and on the defender's resource allocated to the strike. If the attacker survives, the object's survivability depends on the defender's remaining resource and the attacker's revenge attack resource. The conditions when the
preventive strike is beneficial for the defender are elicited under the assumption that the defender distributes its resource optimally between the strike and the protection. The methodology of analysis of influence of different model parameters on the optimal defense strategy is demonstrated.
The cases of single and multiple attackers' facilities are considered.
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