Publication

When NATO’s founding members signed the North Atlantic Treaty on April 4, 1949, they declared themselves “resolved to unite their efforts for collective defense and for the preservation of peace and security.” The greatest threat to these objectives was a military attack by a hostile power—a prospect that led to the treaty’s most famous provision, Article V. Today, more than sixty years later, the threats facing the alliance’s members have changed considerably. An attack in North America or Europe by the regular army of an outside state is highly unlikely. Instead, the alliance must confront an array of more diffuse challenges, ranging from terrorism and nuclear proliferation to piracy, cyberattacks, and the disruption of energy supplies.