With the hot war in Ukraine dragging on and the new cold war between East and West growing, we look at one of the most mysterious aspects of global brinkmanship and the latest two-edged sword of the intelligence world - Grey Zone Warfare. What is it? How do we combat it? And what can we expect from it in the future? And just how does David get that gravelly tone to his voice? If you find yourself confused after this weeks episode, relax. You've entered the grey zone.

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