The core provision of the North Atlantic Treaty that obligates all members to consider an armed attack against one member as an attack against all. It forms the basis for collective defence and was only activated after September 11, 2001.
DEFENCE WIKI / MILITARY DOCTRINE
The core provision of the North Atlantic Treaty that obligates all members to consider an armed attack against one member as an attack against all. It forms the basis for collective defence and was only activated after September 11, 2001.