Dagestan:

Attack certain to add to security fears ahead of the Winter Olympics in Sochi

A female suicide bomber struck a passenger bus in the southern Russian city of Volgograd on Monday, killing five people and injuring 32 others, officials said.

Why Chechnya’s Black Widows are driven to kill

• Chechnya’s Black Widows are fuelled by a toxic brew of grief and imported religious radicalism.