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Viktor Koslov
Played by Andrew Scott
Viktor is a KGB agent who has been sent to Britain to work at the Russian Embassy, though truthfully, he鈥檚 involved in a plot far greater than even he first realises. An old University friendship with is rekindled thanks to pressure from higher powers on both sides. When they meet, Viktor reveals a shocking revelation about Charles' family that shatters his illusions about the true nature of betrayal.