For over two decades, President Vladimir Putin has squeezed dissent in Russia. Critics, journalists, and defectors have faced dire consequences after opposing him. From poisonings to shootings, mysterious falls from windows, and even plane crashes, there is a long trail of silenced voices. Alexei Navalny, whose death in prison is as yet unexplained, had previously fallen ill on a flight from Siberia to Moscow in 2020 after being poisoned with Novichok, a nerve agent. Alexander Litvinenko, a former Russian spy who defected and was a prominent Putin critic, was murdered with polonium-210 in London in 2016. Russian President Vladimir Putin...