Samples of the agent were collected from the door handle of the Skripal home, the park bench where the two collapsed and "a few other places where the Skripals were present," he added.
He said that experts from the Organization for the Prohibition of Chemical Weapons would arrive in Britain on Monday to test samples of the agent used in the Salisbury poisoning — something Russia has requested.
He said scientists from the UN-backed Organisation for the Prohibition of Chemical Weapons would arrive in the UK on Monday to analyse samples of the agent used to poison the Skripals that also left a police officer, DS Nick Bailey, seriously ill.
Russia has summoned the UK's ambassador to the foreign ministry in Moscow, as its foreign minister denied the country was behind last week's nerve agent attack in Salisbury and said it would only cooperate in an investigation if it received samples of the agent.
Three decades later, preserved samples of the agent were shown to be rotavirus.
Besides, two brain samples of the agent 263K-infected hamsters at the 20th, 40th, 50th, 60th and 70th days after inoculation were collected.
Has high-resolution trace analysis been run on a sample of the nerve agent, and has that revealed any evidence as to the location of its production or the identity of its perpetrators?
In a weekend claim widely picked up on social media, the Russian foreign minister, Sergei Lavrov, said that a Swiss laboratory used by the Organisation for the Prohibition of Chemical Weapons had discovered traces in the sample of the nerve agent BZ and its precursors.
Aibek is in the UK to find the last known sample of the nerve agent 'Paroxocybin'.
Mr Johnson said: "Now is the moment for Putin to jam the lid down and send a signal to people: 'You do this, you're going to die'". He told the BBC a sample of the nerve agent would be sent to the Organisation for the Prohibition of Chemical Weapons - the independent international body set up to stop chemical warfare - for analysis.
