Former double agent Skripal, who has lived in Britain since a spy swap in 2010, and his daughter have been in hospital since March 4 after the poisoning that London and its major Western allies have blamed on Russian Federation. The pair were found slumped on a bench in an outdoor shopping complex after the attack with no visible injuries, according to police.
A United Kingdom government spokesman said additional evidence that pointed to Russian Federation including "our knowledge" that Russian Federation was investigating ways to use nerve agents for possible assassinations and the stockpiling of small quantities of the Novichok agent.
Testing had shown that it was military grade nerve agent but it could not be shown to have come from Russian Federation, said Gary Aitkenhead, the chief executive of the Defence Science and Technology Laboratory at Porton Down.
He further claimed to provide scientific information to the government to help reach to some conclusion.
Gary Aitkenhead says "it's our job to provide the scientific evidence that identifies what the particular nerve agent is. but it's not our job to say where that was actually manufactured".
Skripal and his daughter have been in hospital since ingesting the deadly nerve agent novichok in Salisbury, Wilts on March 4. "As the Prime Minister (Theresa May) has set out. this includes our knowledge that within the last decade, Russia has investigated ways of delivering nerve agents probably for assassination - and as part of this program has produced and stockpiled small quantities of Novichoks; Russia's record of conducting state-sponsored assassinations; and our assessment that Russia views former intelligence officers as targets".
The former general said Russian President Vladimir Putin is "the last guy to benefit" from the spy poisoning.
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Putin said there were 20 countries that could manufacture the nerve agent, adding he was "surprised at the speed with which the anti-Russian campaign was promoted and accelerated".
Britain has accused Russian Federation of involvement in the March 4 nerve agent attack on former double agent Sergei Skripal and his daughter, the accusations Russian Federation has vehemently denied.
At the same time, he denied the attack's "sophistication" meant it was likely to have been approved by the Russian leadership, as CNN cited a source briefed on the investigation as saying.
However, he said that Novichok required the sophistication "only in the capabilities of a state actor".
There are doubts that rogue agents could have carried out the attack without approval from the top levels of Russian government. The head of Britain's defense laboratory said Tuesday that its scientists have not identified the precise source of the nerve agent used to attack them. He added Moscow had "no outstanding issues" against the 66-year-old Skripal.
Mr Putin reaffirmed that Russia wanted to take part in the investigation, noting that the victims of the poisoning were both Russian nationals. Russian President Vladimir Putin said on Tuesday he hopes a line in the notorious Skripal case will be drawn at a session of the Executive Council of the Organization for the Prohibition of Chemical Weapons (OPCW) on April 4.