In this March 6, 2018 file photo, police officers stand outside the house of former Russian double agent Sergei Skripal in Salisbury, England. British police say they believe a Russian ex-spy and his daughter first came into contact with a military-grade nerve agent at their front door. Deputy Assistant Commissioner Dean Haydon says in a statement, March 28 police are now focusing their investigation in and around Sergei Skripal's home. (FRANK AUGSTEIN / AP)
LONDON - Russian former double agent Sergei Skripal and his daughter were poisoned with a nerve toxin that had been left on the front door of their home in England, British counter-terrorism police said on Wednesday.
We believe the Skripals first came into contact with the nerve agent from their front door
Dean Haydon, Senior National Coordinator for Counter Terrorism Policing, Britain
After the first known offensive use of a chemical weapon on European soil since World War Two, Britain blamed Russian President Vladimir Putin for the attempted assassination and the West has expelled around 130 Russian diplomats.
Russia has denied any involvement in the attack and has said it suspects the British secret services of using the Novichok nerve agent, which was developed by the Soviet military, to frame Russia and stoke anti-Russian hysteria.
"We believe the Skripals first came into contact with the nerve agent from their front door," said Dean Haydon, Britain's senior national coordinator for counter terrorism policing.
"Specialists have identified the highest concentration of the nerve agent, to-date, as being on the front door of the address," Scotland Yard said in a statement.
Skripal and his 33-year-old daughter, Yulia, have been in a critical condition since being found unconscious on a public bench in the English city of Salisbury on March 4. A British judge has said they may have suffered permanent brain damage.
This is an alleged image of Yulia Skripal, the daughter of former Russian Spy Sergei Skripal, taken from Yulia Skipal's Facebook account on March 6, 2018. (YULIA SKRIPAL/FACEBOOK VIA AP)
The attempted murder of Skripal, a 66-year-old former colonel in Russian military intelligence who betrayed dozens of Russian agents to Britain's MI6 spy service, has plunged Moscow's relations with the West to a new post-Cold War low.
After Britain expelled 23 Russians it said were spies working under diplomatic cover, Russia followed by throwing out 23 British diplomats. The United States and other Western countries, including most member states of the European Union and NATO, expelled over 100 diplomats.
'Enough is enough'
British Foreign Secretary Boris Johnson said the Kremlin had under estimated the Western response to the attack on Skripal and his daughter, which also injured a British policeman.
Johnson told an audience of ambassadors in London that 27 countries have now moved to expel Russian diplomats over Moscow's suspected involvement - which Russia denies.
"These expulsions represent a moment when a feeling has suddenly crystallized, when years of vexation and provocation have worn the collective patience to breaking point, and when across the world – across three continents – there are countries who are willing to say enough is enough," Johnson said.
"If they (Russia) believed that we had become so morally weakened, so dependent on hydrocarbons, so chronically risk averse and so fearful of Russia that we would not dare to respond, then this is their answer," he added.
Putin, who has been dealing with a deadly shopping center fire in Siberia, has yet to respond, though Moscow has threatened to take retaliatory action against the West.
“An analysis of all the circumstances ... leads us to think of the possible involvement in it (the poisoning) of the British intelligence services,” the Russian Foreign Ministry said in a statement on Wednesday before the announcement by British police.
“If convincing evidence to the contrary is not presented to the Russian side we will consider that we are dealing with an attempt on the lives of our citizens as a result of a massive political provocation."
A London court last week gave permission for blood samples to be taken from the Skripals for examination by chemical weapons inspectors to confirm a conclusion by Britain that the military nerve agent had been used.
An unidentified doctor who is treating the Skripals said they were both heavily sedated and unable to communicate, and that it was not possible to assess when or to what extent either may regain mental capacity, according to the court's ruling.
Skripal, who was turned by British spies while in Spain, ended up in Britain after a Cold War-style spy swap that brought10 Russian spies captured in the United States back to Moscow in exchange for those accused by Moscow of spying for the West.
In this Feb 27, 2018 grab taken from CCTV video provided by ITN on March 7, 2018 , former spy Sergei Skripal shops at a store in Salisbury, England. (PHOTO / AP)
Since emerging from the John le Carre world of high espionage and betrayal, Skripal lived modestly in the English cathedral city of Salisbury and kept out of the spotlight until he was found unconscious on March 4.
His house in Salisbury, which featured a good-luck horseshoe on the front door, was bought for 260,000 pounds (US$360,000) in 2011. Skripal was listed at living there under his own name.
In the years since he found refuge in Britain, Skripal lost both a wife and son.
The attack on Skripal has been likened in Britain to the killing of ex-KGB agent Alexander Litvinenko, a critic of Putin, who died in London in 2006 after drinking green tea laced with radioactive polonium 210.
Russia denied any involvement in that killing.
An inquiry led by senior British judge Robert Owen found that former KGB bodyguard Andrei Lugovoy and another Russian, Dmitry Kovtun, carried out the killing as part of an operation probably directed by Russia’s Federal Security Service (FSB).
British police said they would continue to focus their enquiries around Skripal's home address as the investigation continued.