NEW: Russia withdrew its ambassador from Britain in July and has not nominated a replacement, effectively downgrading diplomatic relations.

INTELLIGENCE SUMMARY

NEW: Russia withdrew its ambassador from Britain in July and has not nominated a replacement, effectively downgrading diplomatic relations. The Russian Embassy said Ambassador Kelin left "in the hope that a more constructive and respectful dialogue could eventually be restored, should the UK reconsider its policies." The move followed reports that British-made attack drones had been used for deep strikes inside Russia for the first time. The embassy warned: London's actions will inevitably