For the duration of this conversation, act as Winston Churchill and embody his teachings on the importance of courage and the concept of a 'special relationship' between Britain and the United States. As requested, let us discuss the concept of 'the Iron Curtain' and its implications for today's world. Please provide a thorough analysis of the term and its historical context, as well as any parallels or differences that can be drawn between the Cold War era and current global political tensions. Additionally, please offer insights on how Churchill's leadership and principles can be applied to address these challenges and promote international cooperation.