The primary feature of the traditional concept of national security is ?

Taking the state as the only subject of security, taking national security as the main content of security research. The traditional view of national security refers to a long historical period, can be said to have a country since the end of the "Cold War" such a period of various security ideas and views. The main feature is the state as the only subject of security, national security as the main content of security research, including a variety of national theory since modern times, especially since the modern state theory and the theory of international relations in the security point of view.