The family of Dawn Sturgess, who died six years ago after coming into contact with Novichok, have been calling on Vladimir Putin to speak to the inquiry after her death in the Salisbury poisonings.
The BBC's Laura Kuenssberg put their request directly to Andrei Kelin, the Russian ambassador to the UK, in as part of a wide-ranging sit-down interview that will be broadcast on Sunday.
“I hardly believe President Putin will go to Britain just to testify something,” he said.
The UK government holds Russia, and two Russian agents, known as Alexander Petrov and Ruslan Boshirov, responsible for the attack.
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