Tihomir Ivanov Ivanchev, 38, has been charged with conspiring to collect information which could be harmful to the safety and interest of the state on behalf of Russia.
Alleged network of spies for Russia appear at the Old Bailey standard.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from standard.co.uk Daily Mail and Mail on Sunday newspapers.
The three men and two women, all from addresses in London and Norfolk, were arrested in February for offences contrary to the Official Secrets Act. The three men and two women were arrested in February.