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For decades, Moscow has sought to silence its critics abroad

From its earliest days, the Soviet Union's intelligence services — whether known as the Cheka or by the names of any of its successor agencies like the KGB — kept the government in power by pursuing its opponents no matter where they lived. Intelligence experts say that policy is still followed by Russian President Vladimir Putin, himself a product of the KGB who does not disguise his scorn for perceived traitors, defectors and other political enemies abroad. The Kremlin has routinely denied involvement in such attacks.