The Organisation for the Prohibition of Chemical Weapons (OPCW) said an analysis of samples taken from the former Russian spy Sergei Skripal, his daughter Yulia and a British police officer attacked in Salisbury last month confirmed the assessment of the government.
"Today the worldwide chemical weapons watchdog have confirmed the findings of the United Kingdom relating to the identity of the toxic chemical used in the attempted assassination of Skripal and his daughter, and which also resulted in the hospitalisation of a British police officer".
It's claimed they came in contact with military-grade nerve agent Novichok.
It noted that the chemical was of "high purity" with an "almost complete absence" of any impurities.
U.K. Foreign Secretary Boris Johnson said OPCW's report proves Britain's claim that Russian Federation is responsible for the attack.
But British Foreign Secretary Boris Johnson said, "There can be no doubt what was used and there remains no alternative explanation about who was responsible".
She said the United Kingdom sees the council meeting as an opportunity to update its members as well as the broader U.N. membership on the OPCW findings. The incident has led to a diplomatic crisis between Moscow and the West as Moscow denies any involvement and accuses Britain of inventing a "fake story".
Ms. Skripal was discharged from hospital on Monday but the 33-year-old has said her father is "still seriously ill".
In a statement issued through British police on Wednesday, Yulia Skripal said she did not now want any help from the embassy, adding, "I am safe and feeling better as time goes by".
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The watchdog's report does not say who was responsible for the attack, since that was outside the scope of its mission.
Skripal and his daughter were poisoned on March 4 in the English city of Salisbury.
Yulia Skripal's statement also resolved a controversy along with her uncle, Viktoria.
In 2004, Sergei Skripal was arrested in Moscow and later confessed to having been recruited by British intelligence in 1995.
Russian Federation has said it does not have such nerve agents and President Vladimir Putin said it was nonsense to think that Moscow would have poisoned Skripal and his daughter Yulia.
The Russian Embassy in London questioned the authenticity of Yulia's statement, saying it was crafted to support Britain's version of events and increases suspicions she is being held against her will.
"We'd really like to understand what exactly the British aspect did to adhere to its worldwide obligation under the Vienna Convention on Consular Relations as well as the Allied Consular Convention, and that which were the reasons for this a unfounded conclusion", the embassy explained. Russian Federation vehemently denies any involvement, and it contains responded by expelling exactly the very same number of diplomats.
"I find myself in a totally different life than the ordinary one I left just over a month ago, and I am seeking to come to terms with my prospects, whilst also recovering from this attack on me", she said.