What does General Sir Richard Shirreff suggest is needed for European security in light of NATO's current challenges?

General Shirreff emphasizes that Europe and Canada need to forge a new form of collective security alliance, potentially building upon existing NATO structures. He warns that NATO is currently in danger due to waning American leadership, making European unity the absolute overriding principle moving forward. Some European nations are already taking necessary steps, with Poland spending over 4% of GDP on defense, and Baltic states similarly increasing their military expenditures. However, achieving European unity remains challenging despite leaders acknowledging the need for greater defense spending. This unified approach is essential for establishing a robust security framework that can function effectively with or without traditional American leadership.