There was no sign of it ever being used. Until last week. Now, Britons are taking in the disquieting information that a Novichok nerve agent, a weapon invented for use against NATO troops, was released in the quiet town of Salisbury, its target a former Russian spy named Sergei V. Skripal. Mr. Skripal and his daughter, Yulia, collapsed onto a bench in a catatonic state on March 4, and remain hospitalized, in critical condition. Britain’s Home Ministry on Tuesday indicated that it viewed state-sponsored violence by Moscow as a larger problem, announcing that it would scrutinize a series of suspicious deaths of Russians on British soil. Home Minister Amber Rudd said the police and MI5, Britain’s domestic security agency, would review 14 cases cataloged last year in an investigation by BuzzFeed. The British police also announced an investigation into the death on Monday of Nikolai Glushkov, a close associate of one of Mr. Putin’s most prominent foes. In interviews, chemical weapons experts said it was possible that Novichok nerve agents had been used before on Kremlin targets in Britain, but had escaped detection.
Exposure, either by inhalation or through the skin, leads to muscle spasms, secretion of fluid into the lungs and organ failure, sometimes accompanied by foaming at the mouth. But if the victim has already died, experts said, the police could easily mistake the cause of death for a simple heart attack. “It’s entirely likely that we have seen someone expire from this and not realized it,” said Daniel M. Gerstein, a former senior official at the United States Department of Homeland Security who is now at the RAND Corporation. “We realized in this case because they were found unresponsive on a park bench. Had it been a higher dose, maybe they would have died and we would have thought it was natural causes.” The Russian foreign minister, Sergey V. Lavrov, said on Tuesday that his country had nothing to do with Mr. Skripal’s poisoning, dismissing Britain’s allegation that Moscow was to blame as “nonsense.” Britain had sought an explanation from Russia by the end of the day on Tuesday on how the nerve agent could have been used. But Mr. Lavrov said that Moscow “had received an incoherent response” when it asked London for details, which he said amounted to a “rejection of our legitimate demands.”
The dispute between the two countries has sharply worsened tensions between Russia and the West, already strained by Moscow’s role in the Syrian conflict and its annexation of Crimea from Ukraine. Though American laboratories stopped producing nerve agents around 1970, after the production of so-called third-generation nerve agents like sarin and VX, Soviet scientists continued their work for two decades, producing a “fourth generation.” The Novichok nerve agents came in solid form, like a powder or thick paste, and would not register on the chemical detector paper that NATO troops used. A chemist who worked in the laboratory developing Novichok accidentally inhaled fumes while filling a syringe, and collapsed. Though he was injected with an antidote and eventually awoke, he suffered from depression and epilepsy and died five years later, leaving Vil Mirzayanov, a scientist who helped develop the agent, deeply disillusioned. “Antidotes exist, but what does antidote mean?” Mr. Mirzayanov, who had leaked the project to the press and later immigrated to the United States, told Sky News on Tuesday. “You’re saving a person who has been exposed to this gas — but temporarily, not to die this time. But he will be an invalid for the rest of his life.”
Andrew C. Weber, a former assistant secretary of defense for nuclear, chemical and biological defense programs, recalls picking his way through a secret, abandoned Soviet research facility in Nukus, Uzbekistan, which the United States was asked to helped destroy in the early 2000s. Entering a basement room, Mr. Weber saw a disturbing sight: “dozens and dozens of restraining devices” used to immobilize dogs while their skin was exposed to Novichok agents in the form of a powder or paste. He said that he believed each test involved 50 to 100 dogs, and that at least 1,000 dogs had been killed at the facility. The Pentagon, Mr. Weber said, “devoted a lot of resources to improving our protection, detection and countermeasures against it.” But it did not anticipate its use in an assassination, he said, in part because it was so easily traced to Russia. “It’s obviously tightly controlled by the Russian government,” he said. “It’s implausible to me — possible, but not probable — that this chemical weapon would have been diverted from a Russian facility. It would be well guarded.”
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