Twenty years into the rule of former KGB operative Vladimir Putin, the Kremlin’s reputation for assassination is such that almost no plot seems too far-fetched, from bloody shootings—bullets in the back, for instance—to suspicious defenestrations: liquidations known in the trade as “wet work.” There’s also been a penchant for wildly exotic poisons that seem intended as Kremlin calling cards, reminding Putin’s enemies, when eventually discovered, of the nuclear, biological, and chemical arsenal he controls as well as his very long reach.

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