According to traditional notion, in response to a threat of war, a government has three choices to do

1. To surrender when actually confronted by war, but they won’t advertise this policy as their own, so this move is rarely taken

2. To prevent the other side from attacking by promise to raise the cost of war to an unacceptable level, this security policy is called deterrence

3. To defend itself when war actually breaks out so as to deny the attacking country its objectives and to turn back or defeat the attacking forces altogether with limiting or ending war is called defence