Suspected Dagestan bomber the North Caucasus visited Dagestan last year . Dagestan is an impoverished Russian republic in Tamerlan Tsarnaev region . the Russian Tsar 's groups warring against Dagestan are active , have deep roots in Dagestan . Rajan Menon : Life in Dagestan can be chaotic , violent and short .
Suspected Boston bomber Tamerlan Tsarnaev visited Dagestan last year . Dagestan is an impoverished Russian republic in the North Caucasus region . Radical Islamist groups warring against Russia are active , have deep roots in Dagestan . Rajan Menon : Life in Dagestan can be chaotic , violent and short .