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litvinenko trial russia putin robertson pkg_00011308

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    Former Russian spy deaths through the years

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Former Russian spy deaths through the years

The mystery surrounding former spy Sergei Skripal has prompted comparisons with Alexander Litvinenko -- also a former Russian spy -- who was killed in central London in November 2006. CNN's Nic Robertson looks at other suspicious deaths.

Former Russian spy deaths through the years

The mystery surrounding former spy Sergei Skripal has prompted comparisons with Alexander Litvinenko -- also a former Russian spy -- who was killed in central London in November 2006. CNN's Nic Robertson looks at other suspicious deaths.