Militant leader claims Moscow attackTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoVideoassistenten02/08/2011February 8, 2011Chechen rebel leader Doku Umarov has claimed responsibility for the January suicide bombing at Moscow's main airport. Umarov warned that future attacks could be deadlier.https://p.dw.com/p/Qz3yAdvertisement