Russian agent Alexander Litvinenko was assigned to assassinate him. A European court found that Litvinenko had been murdered, and U.K. authorities charged Litvinenko with a 2018 chemical assault in England. This brought the Kremlin’s role in poisoning its enemies back in the limelight.
Mr. Litvinenko, a vocal critic of President Vladimir Putin died in 2006 from consuming tea laced in polonium -210,, a radioactive element that can cause death. The incident occurred at a London bar.