Scots spy David Ballantyne Smith was a lonely ex-serviceman who turned traitor while consuming online conspiracy theories and pro-Putin propaganda, the Old Bailey heard.
Born in Paisley in Scotland, the 58-year-old spent 12 years in the RAF before moving to Crawley in West Sussex and getting jobs at Gatwick Airport.
He has a grown-up daughter by an earlier relationship and had been married to his second wife Svetlana for 20 years, the Old Bailey was told.