The biography's author Masha Gessen, a journalist born in Russia who has also lived in the US, has also written about Russian president Vladimir Putin.
Dagestan and the rest of the Caucasus republics of Russia have been the site of a long-running Islamic insurgency against Moscow and its local allies. A bombing and separate shooting killed six today.
The Boston Marathon bombings could not have been foreseen in the case files of 8-year-old asylum seeker, Dzhokhar Tsarnaev, and his 15-year-old brother, Tamerlan. What should be questioned is whether US authorities do enough to integrate immigrant children once they arrive.
Bomb suspect Instagram account was deleted recently – unlike Dzhokhar Tsarnaev's other social media accounts. The bomb suspect also 'liked' an Instagram photo linked to Chechen terrorism.
Echoes of one of Tolstoy's great works, inspired by the conflict between Russia and Chechnya, can be found in the final novel by David Foster Wallace.