Russian President Vladimir Putin will stop at nothing in his hunt for dissidents abroad. In his determination, he has found some powerful allies within Western democracies—a practice that should alarm those who prize justice and the rule of law.

In recent weeks, I’ve been collecting stories of Russian dissidents who say they fell victim to exchanges of confidential information between European officials and Russian authorities. The leak of one Cyprus prosecutor’s emails in November has exposed a growing trend: in its hunt to track critics, the Kremlin is recruiting allies within Western states’ law enforcement agencies.

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