Stephen Sackur talks to newsmakers and personalities from across the globe. When thousands of civilian lives are at risk, whether from natural disaster, prolonged hunger or warfare, there is a powerful human instinct to 'do something'. Increasingly that involves military intervention. From Iraq and Afghanistan to Congo and Darfur, humanitarian and military operations co-exist. Conor Foley has years of experience at the sharp end of international aid work. Stephen Sackur asks him if politics has poisoned the humanitarian principle.