Russia’s invasion of Ukraine has created previously unthinkable changes in geopolitics, seemingly overnight. As the situation in Ukraine grows grimmer every day, we also look back at the changing world order. The emerging threat landscape requires immediate coordinated action across national boundaries and geographies. Democracies have to band together to assess the multiple threats posed by the future theaters of conflict—be it land, air, water, or more ominously, cyber. There has to b...