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'Russian spy ring' lived at flat one mile from RAF base
By martin EVANS, Max Stephens and Gordon Rayner
Three Bulgarians arrested in UK linked to suspected Russian espionage
Three Bulgarians suspected of spying for Russia charged in UK
By Luke Harding and Matthew Weaver
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Spies like us: How does Russia's intel network operate across Europe?
By David Mac Dougall
'Russian spies' accused of posing as journalists
By David Brown, Fiona Hamilton and Shayma Bakht
Suspected spies for Russia held in major UK security investigation
By Daniel De Simone and Jeremy Britton