Testing by four laboratories affiliated with the global chemical weapons watchdog have confirmed British findings on the nerve agent used in March's attack on a former Russian spy in the United Kingdom, according to a summary of the findings published on Thursday.
The report puts beyond doubt that it was highly likely Russian Federation carried out the attack, people close to the investigation said, adding that the nerve agent could only be concocted in a very sophisticated laboratory by highly capable chemists who were familiar with the agent. "The latter is concluded from the nearly complete absence of impurities".
The global chemical weapons watchdog has confirmed Britain's findings that the Skripals were poisoned with a military-grade novichok nerve agent.
Britain has called for an OPCW meeting next week to discuss the results of the organization's report.
Johnson said the OPCW's findings were based on testing in four independent, highly reputable laboratories around the world, all of which returned the same "conclusive" results. 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".
Yulia Skripal has now been released from hospital while her father's health is said to be improving.
She said she had declined an offer of assistance from the Russian embassy "at the moment".
"In the interest of transparency, and because unlike the Russians we have nothing to hide, we have asked the OPCW to publish the executive summary for all to see", Mr Johnson said in a statement.
Britain blames Russian Federation for the March 4 poisoning of Sergei Skripal and his daughter Yulia in the English city of Salisbury. Zakharova reiterated that British officials were keeping Yulia Skripal in isolation and said Moscow would continue to demand access to her.
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.
The Russian embassy said that it doubted the authenticity of the statement and suggested it had been crafted to support Britain's version of events.
Russian Federation insists it has destroyed all of its chemical weapons and has responded angrily to suggestions that it targeted Skripal, a former intelligence officer who sold secrets to the British.
"The Salisbury Hospital has never confirmed that Sergei and Yulia Skripal had any symptoms of chemical poisoning and that they were treated precisely for this". She also said she did not yet want to speak to the media.
"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.
Sergei Skripal remains in hospital as he recovers from the effects of the toxic nerve agent.