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What is Novichok and how has it been used?

Questions have been raised again about Novichok after German authorities said Russian opposition leader Alexei Navalny was poisoned with the nerve agent. Mr Navalny, one of the most prominent critics of Russian president Vladimir Putin, fell ill on August 20 and was transferred to a Berlin hospital where tests found he had been poisoned. The Soviet-era chemical came to international attention after five people were poisoned in Wiltshire in 2018.

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