Vil Mirzayanov, who led counter-intelligence for the former Soviet Union's military and helped develop novichok, told The Daily Mail the chemical "causes you convulsions and you can't breathe and after that you die, if you get enough of a dose of it".
"In the interest of transparency, and because unlike the Russians we have nothing to hide", Johnson added, "we have asked the OPCW to publish the executive summary for all to see and to circulate the full report to all state parties of the OPCW, including Russia". The amateur, in his opinion, could not do this.
Investigators at the Organization for the Prohibition of Chemical Weapons confirmed British findings that the Skripals were poisoned with a military-grade nerve agent but didn't say who was responsible.
"We know what's in the Russian playbook, kompromat (embarrassing information) type material, we're all prepared for that".
In a letter to the head of Nato, Sir Mark Sedwill also said that Moscow had an assassination programme based around nerve agents that included attacking a victim by smearing poison on a door handle.
Poisoning of the Skripals: Ex-double-agent Skripal and his daughter were found slumped over in public in Salisbury after apparently being poisoned.
Everton fullback Baines: We can be pleased with Swansea draw
The Ghanaian returned from a three-match ban after he was red carded in his side's goalless draw game with Huddersfield.
Beyoncé just reunited with Destiny's Child onstage at Coachella
She packed heaps more into her Coachella set, bringing out husband Jay Z for "Deja Vu" and dancing with sister Solange . In case you've not been paying attention, this weekend has seen the first half of Coachella 2018 take place.
No decision on Syria yet, Trump weighing all options - WH
Mattis said options would be discussed with Mr.Trump at a meeting of his National Security Council on Thursday afternoon. US President Donald Trump has threatened to strike Syria in response to an alleged gas attack in the Arab country.
Russian Federation has vehemently denied any allegations of involvement in the incident.
The government of Prime Minister Theresa May expelled 23 Russian diplomats in retaliation and called on ir global allies to follow in ir footsteps.
Sergei Skripal remains seriously ill in hospital. The embassy posted on Twitter on Tuesday: "We need urgent proof that what is being done to her is done on her own free will".
In his letter, Sir Mark set out why the Government believes that only Russian Federation has the "technical means, operational experience and the motive" to carry out such an attack.
President Donald Trump warned Russia this week of an impending missile strike against its ally Syrian President Bashar Assad over the alleged use of chemical weapons against his own people, although the president subsequently walked back denunciations of Russian President Vladimir Putin for backing Assad.
Russian Federation denies the British claims about Novichok, saying that it completed the destruction of all its Soviet-era chemical weapons arsenals previous year under worldwide oversight.