Polonium-210: A pretty good way to horribly murder somebody

The long wait time until death seems likely to raise flags, especially considering the political nature of the target. However if the assassins got away with it in the case of Arafat (sya, hypothetically, that it was KGB Jr.), would they be overconfident of the same result with Litvinenko?

It seems unlikely to me; it would make more sense that the assassins wanted the assassination to become public knowledge as a sort of warning.

EDIT: On the wiki article, they quote a member of the Duma (a legislative body in Russia) as saying “The deserved punishment reached the traitor. I am confident that this terrible death will be a serious warning to traitors of all colors, wherever they are located: In Russia, they do not pardon treachery. I would recommend citizen Berezovsky to avoid any food at the commemoration for his accomplice Litvinenko.”

So that seems fairly clear cut. Talk about brazenness Arafat less so. Can anyone provide context as to Arafat’s activities at the time?