At this point the terrorism is mostly futile gestures from a group that hasn't been completely stamped out, but knows that they can't make any significant victories
Chechnya is part of Russia again, and you're seeing a resurgence of the terrorism currently because Russia just ended major counter-terrorism operations in Chechnya, and this is more the terrorists' way of saying "hey! We're not beat yet!"
Also the terrorism is partly a response to Putin/Medvedev's media embargoes on activities in Chechnya. Terrorism is one of the few ways the Chechens can get the Russian people to pay attention to what's going on.

Monster Hunter: pissing me off since 2010.







