Russia demands access to poisoned former snoop and daughter to ensure they do not want help

Moscow has demanded a meeting with Sergei Skripal, the Russian former spy poisoned by a nerve agent in Salisbury, following his discharge from hospital.

Vladimir Putin said he was pleased Skripal had been released from hospital on Friday, more than 10 weeks after the poisoning, and wished him well.

” God award him good health ,” the Russian chairwoman said.” If a military-grade poison had been used, the man would have died on the spot. Thank God he recovered and that just leave[ hospital ].”

Russia's ambassador to London, Alexander Yakovenko, also welcomed Skripal's release, but claimed the UK would be breaking international law if it did not allow access to him and his daughter, Yulia, who was also poisoned and was discharged last month.

Yakovenko said nobody actually knew if the pair were alive and suggested that, if they were, they may have already left the country. Scotland Yard made clear that no details of the security arrangements for the pair would be given.

Salisbury district hospital announced on Friday morning that Skripal had been discharged.

The chief executive, Cara Charles-Barks, said it was good news that Skripal was well enough to be discharged.

” That he, Yulia and DS[ Nick] Bailey have been able to leave us so soon after coming into contact with this nerve agent is thanks to the hard work, skill and professionalism of our clinicians, who provide outstanding care to all our patients, day in and day out ,” she said.

” This has been a difficult time for those caught up in this incident: the patients, our staff and the people of Salisbury. I want to thank the public for their support, and I want to pay a special tribute to both the clinical staff here at the trust and those who work so hard behind the scenes. They've demonstrated the very best of the NHS .”

Quick guide

What is novichok?

Novichok refers to a group of nerve agents developed by the Soviet Union in the 1970 s and 80 s to elude international restrictions on chemical weapons. Like other nerve agents, they are organophosphate compounds, but the chemicals used to stimulate them, and their final structures, are considered classified in the UK, the US and other countries.

The most potent of the novichok substances are considered to be more lethal than VX, the most deadly of the familiar nerve agents, which include sarin, tabun and soman.

While the novichok agents work in a similar way, by massively over-stimulating muscles and glands, one chemical weapons expert said the agents did not degrade fast in the environment and had ‘an additional toxicity that was not well understood. Treatment for novichok exposure would be the same as for other nerve agents, namely with atropine, diazepam and potentially drugs called oximes.

The chemical structures of novichok agents were made public in 2008 by Vil Mirzayanov, a former Russian scientist living in the US, but the structures have never been publicly corroborated. It is thought they can be made in different forms, including as a dust aerosol.

The novichoks are known as binary agents because they only become lethal after mixing two otherwise harmless components. According to Mirzayanov, they are 10 to 100 times more toxic than conventional nerve agents.

While laboratories that are used to police chemical weapons incidents have databases of nerve agents, few outside Russia are believed to have full details of the novichok compounds and the chemicals needed to construct them.

Photograph: Matt Cardy/ Getty Images Europe

Thank you for your feedback.