A screengrab taken on September 13, 2018, from footage broadcast by Russia's state broadcaster Russia Today (RT), shows two men, purported to be Alexander Petrov and Ruslan Boshirov taking part in a television interview.
It comes after the two men suspected of targeting Sergei and Yulia Skripal with novichok have denied being Russian agents or having anything to do with the poisoning.
Britain said that the two suspects were intelligence officers from the Russian Federation military and were acting on orders handed down from somewhere high up in the government of Russian Federation.
Security services believe they travelled from Moscow to the United Kingdom to smeared deadly nerve agent Novichok on a door handle at the Wiltshire home of former spy Sergei Skripal, leaving him and his daughter Yulia critically ill.
"We have repeatedly asked Russian Federation to account for what happened in Salisbury in March and they have replied with obfuscation and lies", Slack said.
The finding by the respected investigative website Bellingcat directly contradicts Russian President Vladimir Putin's claims that Petrov and his accomplice Ruslan Boshirov were merely civilians who travelled to Salisbury to see its cathedral and nearby Stonehenge.
The pair appeared on a state television channel, claiming they weren't behind a nerve agent outrage.
Whatever revelations may pop up, the United Kingdom will stick to its vague version of the Salisbury poisoning incident, analysts said on the heels of an exclusive RT interview with Britain's Skripal case suspects. "Our plan was to spend some time in London and then to visit Salisbury", Petrov said. "What is our fault?"
Britain has said the attack received approval "at a senior level of the Russian state", an accusation Moscow has fiercely denied.
They declined to give any other details about their lives, except to say they work in the nutritional supplements business.
A police twitter account has invited Russian tourists to visit Rochester, after the suspects in the Salisbury Novichok poisoning case claimed they'd been visiting Salisbury cathedral as tourists. In this interview Bashirov and Petrov claimed that he was in Salisbury to see the sights. Witnesses say cannabis wafted from their twin room in the two-star City Stay Hotel in Bow, East London, as they partied through the night.
"We walked around, enjoying those handsome English Gothic buildings", Boshirov said.
"We went to Salisbury on the 3rd [of March]", said Petrov.
Clark asked before adding: "We got no evidence that they actually returned home".
The two men were charged in absentia last week in the UK.
The men are civilians and "we know who they are", Putin told an economic forum in Vladivostok on Wednesday in his first comments on the United Kingdom allegations.
He wouldn't elaborate on how long it took the Russian authorities to find the two men, and said that the Kremlin had nothing to do with arranging their interview. Well, I hope they will come out themselves and speak about themselves.