The NATO Summit comes at a critical time in the Alliance’s history. The global security environment is dangerous and unpredictable. Russia’s actions against Ukraine have challenged the fundamental principles of a Europe whole, free and at peace. An arc of crises surrounds the Alliance, with growing instability and security challenges across the Middle East and North Africa, and beyond, as well as newer threats such as cyber and missile attacks. At the same time, NATO is preparing to complete its longest combat mission and to open a new chapter in its relationship with Afghanistan.