Former Russian spy Sergei Skripal and his daughter were "sitting ducks" because of a lack of home security, the Dawn Sturgess inquiry has been told.
They were poisoned with nerve agent Novichok after it was put on the front door of their home in Salisbury, months before Ms Sturgess died after being exposed to it.
Michael Mansfield told the inquiry into her death the Russian state had "alarming access" to Mr Skripal's location.
In closing statements to the public part of the inquiry, he accused the UK government of an "abject failure" to keep people safe.