A Very Expensive Poison, The Assassination of Alexander Litvinenko and Putin’s War with the West by Luke Harding published in 2016. Litvinenko died a lingering, agonized death from polonium poisoning which was ordered by Vladimir Putin personally. It was Litvinenko’s knowledge of procedures and experience in the Russian secret police that convinced him that only Putin could authorize his murder on British soil. If correct, then Putin is equally guilty of ordering the most recent attack in Britain on Sergei Skripal and his daughter.
Trump must go