Powerful enemies?

From News.com.au this morning. This story continues to fascinate the crap out of me.
Ex-spy's fatal polonium dose 'cost $12m'
BRITISH detectives believe that the radioactive substance used to kill former Russian spy Alexander Litvinenko cost in excess of $12 million, The Times reported today.
The newspaper said preliminary results from the post-mortem on Litvinenko's body have shown that he was given more than 10 times the lethal dose of polonium-210, large quantities of which were found in his urine.
Litvinenko fell ill on November 1, and died on November 23. Several of his friends have blamed the Kremlin for the murder, but Russia has repeatedly denied that it had any involvement in the ex-spy's death.
"You can't buy this much off the internet or steal it from a laboratory without raising an alarm so the only two plausible explanations for the source are that it was obtained from a nuclear reactor or very well connected black market smugglers," an unidentified British security source was quoted as saying.