The Tsarnaev brothers: suspected Boston bombers (via AFP)

Dzhokhar and Tamerlan Tsarnaev, suspected of bombing the Boston marathon, appear to hail from Russia's war-torn Chechnya but had been in the United States for several years. The North Caucasus region of Chechnya has been ravaged by two back-to-back wars since 1994 between Russia's army and increasingly…

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