Military and intelligence officers have been urged to be vigilant with chilling leaked messages warning of potentially deadly spy missions.
MI5 and police intelligence units believe Russian diplomats not chucked out of the UK after the Novichok attacks this year are being mobilised, the Mirror reports.
And they have been asked to record any Russian diplomatic cars spotted in Britain.
The memo – shown to the newspaper – reads: "We are aware that Russian intelligence officers travel widely throughout the UK and that some of the activity undertaken by these officers is intelligence related.
“The Russian Federation Intelligence Services are assessed to pose a substantial espionage threat to the UK.”
Officers are being asked to record the vehicles’ “registration, date, time and place sighted, direction of travel, description and number of occupants”.
It comes after Britain expelled 23 Russian diplomats following a nerve agent attack on former spy Sergei Skripal and his daughter Yulia in March.
The pair were left fighting for their lives but miraculously survived the attack – suspected to have been carried out by Alexander Petrov and Ruslan Boshirov.
In July, Dawn Sturgess, 44, died after being exposed to Novichok used in the bungled assassination attempt in Salisbury, Wilts, while her partner Charlie Rowley, 45, was injured.
Skripal was still an active spy for four Western intelligence agencies – including Britain's MI6, it was been claimed.
A source told The Mirror: “It will take Russia years to build up its capability in the UK, and repeated attempts to begin that process have been stopped. So suspicion falls upon diplomats who remain at the embassy.”
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