Smith, who is originally from Paisley, supplied details about the British embassy in Berlin and its staff in exchange for cash payments.
The 58 year old was caught following an MI5 sting operation in August 2021.
Sentencing him, the judge said that Smith had “put people at maximum risk”, and that he had “betrayed his country”.
Follow STV News on WhatsApp
Scan the QR code on your mobile device for all the latest news from around the country
