Anyone who still believes in the American security guarantee must be an incurable optimist. Trump is further undermining NATO, but Europe’s security debate is still too often conducted by fearful and risk-averse politicians, slow bureaucracy, and former generals who want to replay the previous war, writes Rob de Wijk in his recent column. While Ukraine shows that speed, drones, and innovation make the difference, Europe continues to favour legacy systems while underinvesting in the start-ups driving the future of defence.