It doesn't surprise me that they would kill a former spy but I'm having a lot of trouble believing that they would leave a trail as clear as this one is. If they want to send a message to former spies, there are a lot better ways of doing it than angering Europe.
Anyone want a cup of starbucks coffee?
True, but a less sophisticated killer, say, a person on the street who simply had a grudge against the former spy, would probably not be able to get his hands on Polonium 210. I would wager he would have just tried to shoot the man instead.
there are a lot better ways of doing it than angering Europe
I quite literally spit up my coffee when I read this. What could Russia possibly have to lose by angering Europe? :)