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(FILES) This file screen grab taken from undated video posted on July 3, 2013, on the Islamist rebel mouthpiece kavkazcenter.com shows a man identified as Russia's top Islamist leader Doku Umarov recording his appeal in an undisclosed location. Russia's FSB security agency said on September 27, 2017 it had recovered the remains of the leader of the Islamist armed rebellion in the Caucasus, Chechen Doku Umarov, responsible for several deadly attacks, including a suicide bombing at Moscow's Domodedovo airport. / AFP PHOTO / KAVKAZCENTER.COM / -