“The appeal of poison for Russian assassins is twofold, according to a man who has lived much of his life on the wrong side of Putin, US financier and human rights campaigner Bill Browder.Poisons are notoriously difficult to trace and deaths are sometimes blamed on a victim’s existing health conditions. ‘On the other hand, everyone knows who did it,’s Browder says. Poison has become a kind of Kremlin calling card. ‘Putin likes to have it both ways … make a symbolic point but [escape] the consequences,’ he says. ‘The message is clear: if you challenge [him], you will die.'” The Sydney Morning Herald: Beware the tea: Why do Russians keep being poisoned?