Hours before, Vladimir Putin said Russia has found the pair accused of poisoning former Russian spy Sergei Skripal and his daughter Yulia with novichok in Salisbury in March.
"We know who they are, we have found them", said Putin, speaking at an economic forum in Vladivostok.
On Wednesday morning, Mr Putin said: "We know who they are, we have found them. It will be better for everyone". "There is nothing particularly criminal there, I assure you", Putin said. That argument centred on how they made themselves overly visible to surveillance by taking the train to Salisbury and walking through the city, rather than going by private auto.
Russian Federation had previously said the names given to them by British prosecutors were meaningless.
Since the United Kingdom named the two suspects, US, France, Germany and Canada have agreed that the Russian government "almost certainly" approved the poisoning of the Skripals and have urged Russia to provide full disclosure of its Novichok programme.
"We have repeatedly asked Russian Federation to account for what happened in Salisbury in March, and they have replied with obfuscation and lies", Prime Minister Theresa May's spokesman told reporters.
"I hope they will turn up themselves and tell about themselves", he said.
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Britain says the two men flew from Moscow to London in early March, from where they traveled to Salisbury in England and attempted to kill the Skripals. "Maybe later. Next week, I think", he said.
Prosecutors deem it futile to apply to Russian Federation for the extradition of the two men but a European Arrest Warrant has been obtained and the authorities are also seeking the assistance of Interpol. They spent weeks in hospital before being discharged.
According to British officials who have been combing CCTV footage in subsequent months, the two Russian nationals were seen arriving at London Gatwick Airport on March 2 before being spotted in Salisbury on March 3 and 4.
Officers formally linked the attack on the Skripals to events in nearby Amesbury when Dawn Sturgess, 44, and her partner Charlie Rowley, 45, were exposed to the same nerve agent.
Britain and dozens of other countries kicked out scores of Russian diplomats over the poisoning of the Skripals, and Moscow responded tit-for-tat with an identical number of expulsions.
Russian Federation has consistently denied any role in either incident.