professor jill dougherty who is a former cnn moscow bureau chief. ann, let me start with you. you heard putin's thinly veiled condolences and the kremlin's denial but do you have any doubt that putin was behind all of this? >> i think if you look at the record, if you look at the number of people who have been killed, or poisoned over the last few weeks and months, and years in russia, if you look at putin's past denials, his claims for example that he didn't invite crimea when his soldiers had invaded crimea and look at the number of times that he's lied and shown to lie, it is hard to believe that he wasn't behind this as well, unfortunately. >> good point. jill, how does putin actually benefit from prigozhin's presumed death, both politically