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The Volgograd bombings may have moved the world's focus on the Sochi Winter Olympics onto security matters - but after the terror attacks, how can Russia track down the guilty, and keep them away from the games? Lucy Ash is in Sochi, witnessing - and following - the squads of uniformed Cossacks who are now back on its streets charged with detecting and removing 'undesirables'. But as she finds out, many of the people caught in this security dragnet have nothing to do with terrorism - they are just migrant workers whose faces do not fit.

In Andalucia, Robin Irvine considers the smoke, excitement (and blood), of a yearly ritual - the branding of young bulls bred to fight in arenas across Spain. Times are extremely hard for the Spanish economy, and for the entire bullfighting culture. But he sees a community event still bursting with life and vigour, much like the energetic young bulls themselves.

(Photo: People detained in Russia's Winter Olympics host city of Sochi during a city-wide round-up of illegal migrants, walking in single file toward a district police station. Credit: Mikhail Mordasov/AFP/Getty Images)