A Russian scientist told state media Tuesday he worked on an official programme to produce the nerve agent Britain says was used on ex-spy Sergei Skripal, contradicting Moscow's claims it never developed Novichok.
Leonid Rink told RIA Novosti state news agency he worked on a state-backed programme up to the early 1990s, adding that the former double agent and his daughter would be dead had Moscow been involved in his poisoning.
"They are still alive. That means that either it was not the Novichok system at all, or it was badly concocted, carelessly applied," he said.
"Or straight after the application, the English used an antidote, in which case they would have to have known exactly what the poison was," he said.
Rink said he worked at a state laboratory in the closed town of Shikhany for 27 years, where the development of Novichok formed the basis of his doctoral dissertation.
"A large group of specialists in Shikhany and Moscow worked on 'Novichok'," he said.
Deputy Foreign Minister Sergei Ryabkov last week said Moscow never had any programmes to develop Novichok.
The foreign ministry told AFP on Tuesday this remained its position. The state news agency later edited the interview with Rink to claim that "Novichok" was the name given to the nerve agent in the West, and had not been used in Russia.
Vil Mirzayanov, a Russian chemist who moved to the US in the 1990s and first revealed the existence of Novichok nerve agents, told AFP he knew Rink through their work on the chemical weapons programme.
"Several hundred people" worked on the programme, he said.
But unlike Rink, Mirzayanov has maintained the Russians carried out the attack.
Foreign ministry spokeswoman Maria Zakharova earlier said Britain had chosen the name "Novichok" because it sounded Russian and would implicate Moscow in the attempted killing.
The name "immediately creates associations with Russia, something Russian, so as to immediately focus attention on our country," Zakharova said.
She added that Britain, Slovakia, the Czech Republic or Sweden could have been the source of the nerve agent.
The countries have denied the claims and on Monday Sweden said it had summoned Russia's ambassador for talks over the allegations.
Before the Russian foreign ministry distanced itself from the chemical weapon, Senator Igor Morozov said Moscow had once developed Novichok but had ceased doing so and destroyed its stockpiles.
London and its allies say Russia was behind the poisoning in the English city of Salisbury, but Moscow has angrily denied any involvement.
President Vladimir Putin -- who was re-elected for a fourth term on Sunday -- has called the claims "drivel, rubbish, nonsense".
His spokesman, Dmitry Peskov, has said London must produce proof of a Russian connection or apologise.
Russian politicians have suggested the poisoning was part of a Western plot to whip up anti-Russian sentiment ahead of the presidential election at the weekend and the World Cup that starts in Russia in June.
'Campaign of disinformation'
The British Foreign Office on Tuesday published a video via Twitter that called the Russian response "a campaign of disinformation".
skripal was a former Russian officer who sold secrets to Britain and moved there in a 2010 spy swap.
He remains in a coma along with his daughter after they were found unconscious on a park bench.
Investigators from the international Organisation for the Prohibition of Chemical Weapons (OPCW) arrived in Britain on Monday to collect samples of the nerve agent.
Britain last week announced the expulsion of 23 Russian diplomats, prompting a tit-for-tat response from Moscow. The expelled Russians left their embassy in London on Tuesday.
Britain has also announced a boycott by members of the royal family and ministers of the World Cup.
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