Most of the time, when we read and hear about security we are talking about traditional, national security conceptions of security. In the traditional conception of security, the greatest danger to a country is from military threats. The source of this danger is another country that by threatening military action endangers the core values of sovereignty, independence, and territorial integrity.

What is the term given to a coalition of states that coordinate their actions to deter or defend against military attack?

Alliance

An alliance is a coalition of states that coordinate their actions to deter or defend against military attack.