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AP Explains: Novichok That Sickened Navalny a Cold War Relic

Associated Press

   MOSCOW - Novichok, a deadly nerve agent that has left Russian
   opposition politician Alexei Navalny in a coma and nearly killed a
   former Russian spy and his daughter in 2018, was the product of a
   highly secretive Soviet chemical weapons program. Here is a look at the
   agent and the history of its development.

   How lethal is Novichok?

   Novichok, the nerve agent used in the attack that nearly killed former
   spy Sergei Skripal and his daughter, Yulia, in the English city of
   Salisbury on March 4, 2018, has been described as much deadlier than
   any U.S. equivalents.