The Russian Embassy in the UK hints at London's involvement in the poisoning of Sergei Skripal, the ex-GRU agent. This is obviously mentioned in the official commentary of the diplomatic office.
The two victims isolated from public and even their family, evidence - from pets to entire houses - destroyed, UK media response “under government control”. If you have nothing to do with a crime, why tie up loose ends pic.twitter.com/vdmy3phJsV— Russian Embassy, UK (@RussianEmbassy) April 8, 2018
As is known, MI6, the British secret intelligence, recommended that former GRU colonel Sergei Skripal and his daugther Yulia change identities and move the the U.S. to avoid any new assassination attempts. This was decided after negotiations between MI6 and their counterpart from the CIA.