The government isn't going to reveal its source for the information and why would it as that would likely put lives in jeopardy. These recently synthesized nerve agents leave behind telltale signatures in their breakdown products. I'm sure the "west" has gleaned much information from Vil Mirzayanov who had a top level role in the development and testing of these agents, in violation of the Chemical Weapons Convention to which Russia is a signatory. Mr.Mirzayanov now lives in exile in the US after being charged with treason for revealing the secret chemical weapons program.
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