When Russia began its invasion of Ukraine, NATO was already in the early stages of drafting its 2022 Strategic Concept. The war quickly overshadowed other issues, and NATO quickly adapted its strategic vision to refocus on the alliance’s primary mission of deterrence and collective defense. Kurt Volker, former U.S. ambassador to NATO, discusses how solidarity with Ukraine has united NATO in a way that hasn’t been seen in a long time and examines the threat Russia’s expansionist mindset poses to NATO member states.