The past twelve years have wrought radical changes in the security-policy environment on both sides of the Atlantic. Though the threat of terrorism has been at centre-stage since 11 September 2001, it is just one of a large number of contemporary challenges in the field of security policy. Others are organized crime, smuggling of all kinds, migration, environmental pollution and ethnic conflict.
The international community has modified and extended existing multilateral cooperation mechanisms to take account of these far-reaching changes. The mechanisms are coordinated by a range of international organizations.