Well if you'd care to recall Trotsky his assassination might also make you wonder why. Trostky was cast out of Soviet Russia and was a non existant threat to Stalin yet he had him killed anyway.
Putin is a very odd leader. Being that he was KGB I wouldn't think it odd that he'd do it. And I also ask even though there are certainly ex-spooks that would want to do this how could they access such a rare and limited compund without alerting or having the support of a nation? Certainly spooks not associated directly with any nation wouldn't really use such rare materials to assassinate someone would they given the number of more cost effective ones, even ones that would leave a marker?
And I do believe Putin is this cold. Putin is ex KGB. Ex high ranking KGB. To be one of them you have to be pretty much a sociopath.
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