Britain is looking for a "proportionate way" to respond to the threat posed by Russia, a spokesman for Prime Minister Theresa May said on Tuesday, after a retired Russian army official said the poisoning of a former spy could start a new world war.
The chief executive of the Defence Science and Technology Laboratory at Porton Down, Gary Aitkenhead, told Sky News on Tuesday that his team has so far not been able to prove the military-grade nerve agent was made in Russian Federation, which the United Kingdom and its allies have blamed for being behind the attack.
"We have not verified the precise source, but we have provided the scientific information to the Government, who have then used a number of other sources to piece together the conclusions that they have come to".
"We hope that during those discussions a full stop will be placed on (the issue of) what happened" to Skripal, Putin said ahead of the meeting on Wednesday of the Organisation for the Prohibition of Chemical Weapons (OPCW).
Moscow has denied any involvement in the incident.
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He described the nerve agent as "an extremely toxic substance" with no known antidote.
"It is our assessment that Russian Federation was responsible for this brazen and reckless act and, as the worldwide community agrees, there is no other plausible explanation", the spokesperson said.
A government spokesperson said on Tuesday: "We have been clear from the very beginning that our world leading experts at Porton Down identified the substance used in Salisbury as a Novichok, a military grade nerve agent".
US President Donald Trump defended his embrace of Vladimir Putin Tuesday, saying good relations were important but claiming no one had been tougher on Russian Federation.
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".
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Russia's Foreign Minister Sergei Lavrov has said that Skripal's poisoning was "in the UK's interests" and accused the West of playing "children's games".
"Russia is interested in establishing the whole truth of the matter", he said. "We identified that it is from this particular family and that it is a military grade, but it is not our job to say where it was manufactured".
"We are witnessing obvious prevention of access for Russian representatives to Russian victims", she said.
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"There's nobody been tougher on Russia", Trump said in a news conference at the White House with Baltic leaders.