Investigators from the Organisation for the Prohibition of Chemical Weapons (OPCW) said the nerve agent was "of high purity".
"The chemical weapons watchdog did not explicitly name Novichok in its published summary, say where the poison may have come from or assign blame for the attack".
Britain has blamed the attack on Russia, sparking the expulsion in excess of one hundred fifty Russian diplomats from western countries.
Ms Zakharova, Russia's Foreign Ministry spokeswoman, challenged Britain to prove the Skripals were not being held hostage, noting that no-one except British authorities had seen either of them for over a month. She added that Moscow will continue to demand access to her and prod Britain to share evidence in the case.
The British mission to the United Nations has requested a meeting of the Security Council on the Organization for the Prohibition of Chemical Weapons (OPCW) report.
The worldwide chemical watchdog is preparing to release its report on the nerve agent used to poison a former spy and his daughter in southwestern England as Russian Federation continues to deny suggestions that it was behind the attack.
Harvey, Irma, Maria and Nate retired as hurricane names
You probably already know that hurricane names go in alphabetical order throughout the season, but it's more structured than that. In the Atlantic and Eastern North Pacific, male and female names alternate alphabetically and the lists are used every six years.
On Sunday, the Bishop of Salisbury, Nicholas Holtam, will lead a "service of cleansing and celebration" in the parish church of St Thomas', not far from where the Skripals were found.
On April 3, Chief Executive of the Defense Science and Technology Laboratory (DSTL) at Porton Down Gary Aitkenhead told Sky News that British experts had been unable to identify the origin of the nerve agent used to attack Skripal and his daughter.
Others include intelligence that Russia has made nerve agents and studied how to use them for assassinations, and the view of Russian President Vladimir Putin's government that traitors are legitimate targets.
The Skripals were found unconscious on a bench on 4th March.
"That's sobering. It demonstrates how reckless Russian Federation is prepared to be, how little the Kremlin cares for the global rules-based order".
"The results of analysis by the OPCW designated laboratories of environmental and biomedical samples collected by the OPCW team confirm the findings of the United Kingdom", OPCW reported Thursday. "There can be no doubt what was used and there remains no alternative explanation about who was responsible - only Russian Federation has the means, motive and record", Johnson said. She declined the Russian embassy's offer to help. Yulia was discharged from Salisbury District Hospital this Monday, while her father is in a stable condition and recovering slowly.
"I've been made conscious of my distinct contacts at the Russian Embassy who've kindly supplied me their support", Skripal, " a Russian citizen who was seeing her daddy at the palace town of Salisbury, stated in the statement. She also said she did not yet want to speak to the media.