Senior Chechen fighter Doku Umarov vowed to spread his attacks from the Russian-ruled North Caucasus into the nation's heartland.
One of the most populous regions in the mainly Muslim north Caucasus, Chechnya declared independency after the collapse of the Soviet Union in 1991 but was attacked by Russian forces in two wars since the mid-1990s.
Still low-level insurgency continues in Muslim states controlled by Russia.
"Blood will no longer be limited to our (Caucasus) cities and towns. The war is coming to their cities," the Chechen rebel leader said in an interview on the unofficial Islamist website kavkazcenter.com.
45-year-old Umarov calls himself the "Emir of the Caucasus Emirate". He aims to create an independent state under Islamic administration in the heavily Muslim North Caucasus.
"If Russians think the war only happens on television, somewhere far away in the Caucasus where it can't reach them, inshallah (God willing) we plan to show them that the war will return to their homes," he said in the interview posted on Sunday.
The Kremlin declined immediate comment.
Umarov, who has been wounded several times fighting Russian forces, is believed to be hiding in the mountains of Chechnya. The website showed Umarov in woodland in front of a large flag in Arabic script.
Umarov's group already claimed responsibility for a train bombing between Moscow and St Petersburg that killed 26 people last November, plus a suicide bomb attack in June which left the leader of Ingushetia, Yunus-Bek Yevkurov, fighting for his life, and an August Siberian dam disaster that killed 75.
ReutersLast Mod: 16 Şubat 2010, 08:18