May spokeswoman Alison Donnelly told reporters Thursday the United Kingdom remains confident "These men are officers of the Russian military intelligence service who used a devastatingly toxic chemical weapon on the streets of our country".
Britain said the attack was nearly surely approved at a top level of the Russian government.
The men, who United Kingdom authorities named as Alexander Petrov and Ruslan Boshirov, said they were in Salisbury in March to see the famous Salisbury Cathedral.
They've been accused of acting as Russian intelligence agents and attacking a former double agent in Salisbury, but the two men say that they're just regular businessmen who work in sports nutrition. Petrov and Boshirov told RT they were visiting the "wonderful town" of Salisbury, England, to see its famous cathedral. "What is our fault?" Experts say that is extremely rare for a 39-year-old man, and that the department that issued his passport normally only does so for those working in certain roles for the government.
Two men suspected of targeting the Skripals with novichok have denied being Russian agents or having anything to do with the poisoning.
Britain claims that Sergei Skripal and his daughter Yulia were affected by a nerve gas of the Novichok class in Salisbury on March 4. The number, called by the Observer on Saturday, links to a reception desk at the Russian defence ministry, where a clerk said he would not speak with journalists or provide any information. The two fell critically ill but recovered after weeks of intensive care in hospital.
"When your life turned upside down, you don't know what to do and where to go", Boshirov said. Sadly, it is what we have come to expect. "Yes they are our real names".
The source said it is believed they could have met a handler who worked at the embassy and that the medic may have been in an oversight role.
Margarita Simonyan, RT's editor-in-chief, who conducted the interview, said on Twitter that "their answers are their responsibility" and it's up to viewers to decide whether to believe the men, who were "extremely nervous and sweating".
Skripal, a former colonel in the GRU who betrayed several agents to the MI6 intelligence service in Britain, and his daughter were discovered unconscious on a Salisbury bench last March.
"We, of course, looked at what kind of people they are, and we know who they are, we found them", Putin told an audience at the Eastern Economic Forum in the eastern Russian city of Vladivostok.
Both men on Thursday denied that they are GRU agents or that they were in possession of the Soviet-made Novichok nerve agent. "They said they would not go to the studio and only agreed to do the interview in her office".
'There is nothing special and nothing criminal about it, I'm telling you'.
In the TV broadcast, the men were asked why they went to Salisbury on two different days.
They appeared Thursday on the state-funded RT channel, saying they visited Salisbury as tourists and had nothing to do with the poisoning.