Ruslan Boshirov and Alexander Petrov were charged in absentia over the Salisbury poisonings
The naming of Sergeev also strengthens a link between the Salisbury assault and the poisoning of an arms dealer in Bulgaria in 2015, as well as a blast at a Czech arms depot. "The three have been operating together in other parts of the world. We are liaising with those countries," Mr Haydon said.
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