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He also said one of the targeted locations was right next to one of the offices of the FSB Russian security services.

Weeks later, after 37 days in captivity, Sergei was made to confess to assisting Ukraine on camera by people who introduced themselves to him as FSB.

The FSB said Kuzin had rigged the car with a homemade explosive device and the bomb had then been set off remotely from Ukraine.

In a statement the FSB said the two had declared "false information about themselves when receiving permission" to enter Russia.

Russian state-run news agencies reported that the country's security service FSB had accused the diplomat of providing false information on his documents and carrying out espionage activities.