remember the murder of Litvinenko?

[SydneyRover]

Apparently MI5 didn't ..................

''The MI5 officers also admitted that the British agency was at first stunned by the brazenness of the attack on the Skripals. “We probably hadn’t calculated just how determined and ruthless our adversary might be,” Tom said''

''Kremlin agents targeting Russians in UK, MI5 warnsBritain is alert to interest being shown in certain individuals, agent tells Sky News''

https://www.theguardian.com/uk-news/2021/mar/03/kremlin-agents-targeting-russians-in-uk-mi5-warns