The former security guard started gathering secret papers out of hatred for the UK and support for Russian leader Vladimir Putin. In 2020, he wrote two letters to top Russian Embassy staffers, one of which revealed the name of a diplomat who had served in Russia, designated as X, as well as information about coworkers.
In a televised sentencing at the Old Bailey on Friday, Mr Justice Wall jailed the ex-RAF serviceman to 13 years and two months.
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