Over the course of its 75-year history, NATO has weathered many storms. At least two previous crises were existential – and in both cases, the US played a key role. The new crisis in the transatlantic alliance, triggered by President Trump, runs deeper. Europe needs a bold and strong strategy to brave the storm. Gerlinde Niehus, former Deputy Director for Defense and Security Cooperation at NATO, analyzes the current situation for us.