though can can't be linked yet, experts say it's a tactic emblematic of groups fighting russia from win its own borders. >> what's happened in the last couple years is that the insurgency in the northern caucuses expanded into a number of different neighboring republics. and it's not a unified insurgency. >> you andrew cup offens says rebels in the northern region of russia from ossetia and dag stan are fighting for an islamist republic. they've taken their attacks to cultural centers and elsewhere. many of them follow rebel leader amarov, linked to a bombing in moscow's subway last year, he's on the state department's list of terrorists. as deadly as the militants from the region are, within their ranks, experts say is a group