Litvinenko poisoning (2006)
Alexander Litvinenko, a former FSB officer turned Kremlin critic, was poisoned with polonium-210 in a London hotel. He died three weeks later. A British public inquiry concluded the assassination was 'probably approved' by President Vladimir Putin.
A UK judge named two Russian suspects, both denied involvement; diplomatic tensions followed.
The case became the benchmark for Russian assassinations of defectors abroad, with no one ever brought to trial.
It established the pattern the current indictment describes: Russian agents targeting critics and defectors on foreign soil, with Moscow denying involvement.
