Alexander Litvinenko killing: Russia responsible for assassination, European court rules - CNNhttps://www.cnn.com/2021/09/21/europe/russia-responsible-assassination-alexander-litvinenko-echr-intl/index.html
Murder of a Former K.G.B. Agent | The New Yorkerhttps://www.newyorker.com/magazine/2016/03/07/murder-of-a-former-k-g-b-agent