Spy poisoning: Russia stockpiling nerve agent, says Johnson

Russia has been stockpiling the nerve agent used in the attack on an ex-spy and his daughter for a decade, Foreign Secretary Boris Johnson has said.
He also dismissed a suggestion by Russia's EU ambassador that the agent might have come from a UK laboratory.
Vladimir Chizhov had said the Porton Down lab in Wiltshire may have been the source of the substance.
Sergei and Yulia Skripal remain critically ill in hospital after being exposed to the substance in Salisbury.
They were found slumped on a bench in the Wiltshire city on 4 March.
Prime Minister Theresa May has said Russia is "culpable" for the attack.
Experts from the Organisation for the Prohibition of Chemical Weapons (OPCW) will arrive in the UK on Monday to test samples of the chemical.
The results are expected to take a "minimum of two weeks", the Foreign Office said.
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UK Prime Minister Theresa May told MPs that Porton Down - Britain's military research base - identified the substance used as being part of a group of military-grade nerve agents known as Novichok developed by the Soviet Union.
Mr Johnson told the BBC's Andrew Marr Show: "We actually have evidence within the last 10 years that Russia has not only been investigating the delivery of nerve agents for the purposes of assassination, but has also been creating and stockpiling Novichok."
He said Russia's reaction to the incident "was not the response of a country that really believes itself to be innocent".
Mr Chizhov, also speaking to the Marr Show, said Russia had "nothing to do" with the poisoning of Mr Skripal and his daughter Yulia.
He said Russia did not stockpile the poison and that the Porton Down lab was only eight miles (12km) from the city.
When asked how the nerve agent came to be used in Salisbury, he said: "When you have a nerve agent or whatever, you check it against certain samples that you retain in your laboratories.
"And Porton Down, as we now all know, is the largest military facility in the United Kingdom that has been dealing with chemical weapons research.
But pressed on whether he was suggesting Porton Down was "responsible" for the nerve agent in the attack, Mr Chizhov said: "I don't know. I don't have any evidence of anything having been used."
He said a number of scientists who claim to be responsible for creating some nerve agents "have been whisked out of Russia and are currently residing in the United Kingdom" but no stockpiles of chemical weapons had left the country after the collapse of the Soviet Union.
He added that there were "no stockpiles whatsoever" of nerve agents left in Russia.