North Caucasus: A Journey Through Russia's Killing Zone

In the southwest corner of Russia, an Islamist insurgency has spread out of Chechnya into neighboring regions of the North Caucasus and is claiming hundreds of lives a year.

Moscow-based reporter Tom Parfitt set out on a journey through five Russian republics -- Kabardino-Balkaria, North Ossetia, Ingushetia, Chechnya and Dagestan -- to examine the roots of the conflict and to find out what drives young men to join the rebels.