>> that is fascinating. david, what do you think about that? >> i think that joe's explanation of sociology of russia is really important. i also need to focus on the politics and a couple of things that are important, first of all this is the anniversary of the assassination of one of president putin's greatest opponents. boris months off. he was assassinated. and so there is a climate a very clever. not this is not a new phenomenon in russia. it's got a long history. but i think that political angle is very formed indeed. secondly, i think it's vital that we think about the different institutions of the russian state. because that has been a drive to centralize obviously. and a husband symbolized in the last few days by the picture of president putin pulling his military officials and national security officials in front of him to explain why they agree with him. we have seen the centralization