
Collective defense is a coordinated response to a common security problem by two or more countries. The core of collective defense is political: a commitment by different nations to come to each other’s aid if attacked. Existing collective security arrangements for the U.S. and its allies were designed for one kind of threat. Now they must deal with others, including new threats, if they are to remain relevant to national security. In particular, the U.S. and its allies agree that it would be useful to extend collective defense arrangements against potential cyberattacks, but implementation has proven difficult because of the […]