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Katrin Ivanova, Dzhambazov's partner, was jailed for nine years and eight months by Judge Justice Hilliard.

Mr Justice Hilliard said using the UK as a base to plan spy operations was a "very serious offence" which "undermines this country's standing with allies".

Judge Mr Justice Hilliard said he carried out the "vicious and brutal" stabbing fuelled by his "resentment and jealousy".

Handing down a life sentence with a minimum term at Newcastle Crown Court, Judge Mr Justice Hilliard said MacPhail was "filled with resentment" and intended to kill Holly in the "vicious and brutal" attack.

Mr Justice Hilliard, who previously lifted restrictions to allow the identity of MacPhail to be reported, said the "vicious and brutal" attack was motivated by "resentment and jealousy".