The widow of former Russian spy Alexander Litvinenko said "nothing" had changed between her husband's death and the Novichok poisonings in Salisbury.
Marina Litvinenko’s husband died in 2006 after being poisoned in London with a cup of tea laced with Polonium 210.
Mr Litvinenko’s assassination was "probably" ordered by President Vladimir Putin, a public inquiry in 2016 ruled.
Two years after that ruling, 44-year-old Dawn Sturgess died in Wiltshire after coming into contact with Novichok in what she thought was a bottle of perfume, an incident Mrs Litvinenko said she "couldn't believe".