By MICHAEL SCHWIRTZ and ELLEN BARRY
A day after an unusual air attack on what officials here said was a militant base in Russia’s North Caucasus region, President Dmitri A. Medvedev warned separatist fighters in the mostly Muslim region to surrender or “be destroyed.”
Russia has been battling Islamist separatists in the North Caucasus for nearly two decades, but violence in the region occurs almost daily, and attacks in Moscow and elsewhere are not uncommon.
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