al baghdadi, how significant would this be if the leader of isis was killed? why is he believed to be, arguably, the most dangerous man in the world? >> well, it would be a huge symbolic event in the war against the islamic state if abu bakr al baghdadi were, in fact, killed. a big note of caution here, he's very careful about his security, very rarely participates in these kinds of large meetings with military councils, so it's -- we have to take that into account as we evaluate these russian claims. but at the same time, this would simply be a blow to the ideological underpinning that isis bases its global efforts. would it actually stop what has been an ongoing expansion of the islamic state's reach all over the world, i mean when abu bakr al baghdadi was really growing isis at its height it was an effort to take territory in iraq and syria, that phase is now