Dagestan, with its overwhelmingly Muslim population, has become Moscow's second front in the war against Islamic extremism. Parts of the region in Russia's North Caucausus are so remote they can only be reached by helicopter. Fighting between Russian troops and heavily armed insurgents is a constant reality. A policeman has been shot dead and two militants were killed in the latest in a wave of suicide bombings and attacks on police. The republic stategically borders war-torn Chechnya and oil-rich Azerbaijan, making it the new front line in a separatist war in the Caucasus.