Caucasus Conflict Could Explode at Winter Games<p>As security forces search for “black widows” targeting the Sochi Olympics, NBC News’ Richard Engel travels to the heart of Russia's Islamic insurgency.</p>Get more newsLiveonPrintSaveCreate your free profile or log in to save this articleJan. 21, 2014, 1:51 AM UTC / Updated Jan. 21, 2014, 2:22 AM UTC