Same with Litvinenko. We will never find out the true story. Was it a message? Probably. But from who to who? Might have been FSB, but there were plenty of other parties that really didn't like Litvinenko and could have used Russian Polonium either to blame the FSB or to tell the FSB not to fuck with them, because they had the means to blame them for random hits (or a million other possible reasons).
According to the book 'A Very Expensive Poison' by Luke Harding, the Polonium used in the Litvinenko assassination is only produced in one reactor in the world, located in Ukraine. It would have been almost impossible to obtain without FSB knowledge or collusion, leading investigators to believe that Putin had direct knowledge and/or approval.
https://www.theguardian.com/world/2007/may/22/russia.lukehar...
A commendable stance, IMHO. (From a most uncommendable unregime).
They also have no extradition treaty at all with the US. Hence why Snowden is there, I guess.
I'm also not sure it's plain insecurity. I'm sure there are people not too far removed from him who if they could, would try to get to him -however, he goes to extreme measures to ensure he neutralizes possible threats when identified --including relatives and "old hands".
Although, being such a tyrant (insecure as he might be) why doesn't anyone of the people at his core who live in fear for themselves and everyone else just go on a final mission against him? It's not like he's the only one armed --plus he'd have to remain awake 24x7.
You need a lot of elements to come together to murder someone who is well protected and expects to be the target of violence, while having a state to protect them. The scary thing is that of course, sometimes, this does happen; when it does there is very very little that can be done to stop it, short of you aforementioned 24x7 sleeping cycle.
Not because that plot itself failed. But because it overshadows the truly impressive number of other attempts at Hitler's life, all failed: https://en.wikipedia.org/wiki/List_of_assassination_attempts...
As you say, reasonably that translates into, "I'm insecure."