Moscow explosion: Experts say the explosion, which killed at least 35, will likely be traced to Russia's volatile north Caucasus region, where political murders, bombings, and kidnappings occur almost daily.
Russia considers Chechen separatist Akhmed Zakayev, picked up in Warsaw today under an international arrest warrant, as 'Enemy No. 1.'
A Russia bomb that killed six people in the Russian city of Stavropol has led to speculation about jihadis or Islamic militants. But analysts worry about a widening circle of instability – and players – in the north Caucasus.
Chechen warlord Doku Umarov claimed responsibility for the Moscow metro bombings that killed 39 people earlier this week and threatened more attacks. Is Umarov leading a Chechen version of Hamas?
In Russia's restive republic of Dagestan, bombings killed 12 people and injured 23 just two days after the devastating Moscow attack.
The recent Moscow metro bombings have deep historic and religious roots. Russia should reevaluate counterinsurgency policies, root out corruption, and counter the growth of radical Islam.