Radio 4's series on modern warfare and the consequences for global peace.
4: The New Peace Makers. Edward Stourton looks at two war-torn parts of the world - Sierra Leone and The Balkans. He investigates the powerful new instruments that might be deployed in the fight for peace. Guests include Dr Mary Kaldor of the London School of Economics and Lt Col Tim Spicer of Sandline. Producer Sue Davies. Repeated Sunday 5pm