SALISBURY, England (Reuters) – A former Russian double agent convicted in Moscow of betraying dozens of agents to British intelligence was critically ill in hospital on Tuesday after he was exposed to an unidentified substance in southern England, sources said.

Sergei Skripal, once a colonel in Russia’s GRU military intelligence service, was given refuge in Britain after he was exchanged in 2010 for Russian spies caught in the West as part of a Cold War-style spy swap on the tarmac of Vienna airport.

But the 66-year-old former spy and a

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