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.
Gary Aitkenhead Chief Executive of the Porton Down defence laboratory handling the case investigation said that analysts had identified it (nerve agent) as military-grade Novichok but they had not proved that it was made in Russian Federation as per news outlet France 24.
"We have not identified the precise source, but we have provided the scientific info to government who have then used a number of other sources to piece together the conclusions you have come to", Aitkenhead said.
"However, he confirmed the substance required "extremely sophisticated methods to create, something only in the capabilities of a state actor".
Mr Aitkenhead said blame had been laid at the door of Russian Federation because of other information available to the British government.
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He also pointed out that "it is our job to provide the scientific evidence of what this particular nerve agent is, 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".
Moscow has denied any involvement in the incident. Police said they had been exposed to a nerve agent.
Russia's President Vladimir Putin, listens to a reporter's question during a joint news conference with Turkey's President Recep Tayyip Erdogan, following their meeting at the Presidential Palace in Ankara.
He said: "It is a cold war". He argued that Russia had no motive to attack Skripal, who was released in 2010 spy swap from a Russian prison where he was serving time for spying for Britain.
Filatov says Russian Federation wants Britain to "provide every possible element of evidence" it holds about the March 4 attack on Sergei Skripal and his daughter Yulia in the English city of Salisbury. "It certainly isn't anything that came from our facility", he said.
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"Yury Filatov, Russia's ambassador to Ireland, says Moscow asked the Organization for the Prohibition of Chemical Weapons "to call an extraordinary session" at its headquarters in The Hague".
After the first known use of a military-grade nerve agent on European soil since World War Two, Britain blamed Russian President Vladimir Putin for the attempted murder, and the West has expelled around 130 Russian diplomats.
On Saturday, Russian Foreign Ministry spokeswoman Maria Zakharova wrote on Facebook that more than 50 diplomats and staff members of the United Kingdom diplomatic mission in Russia would have to return to the United Kingdom in order to maintain the parity in the number of diplomatic personnel of the two countries.
"Skripal's daughter Yulia is getting better after spending three weeks in critical condition due to the nerve toxin attack at her father's home in Salisbury, the hospital where she is being treated said last Thursday".
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