BORIS Johnson yesterday revealed Vladimir Putin’s Russia has been stockpiling the nerve agent used in the Salisbury attack for a decade

The Foreign Secretary said it was producing Novichok despite saying it had destroyed all chemical weapons.

3 Boris Johnson says the Russians have been developing chemical weapons for a decade Credit: Reuters

Mr Johnson stressed: “The trail of responsibility leads inexorably to the Kremlin.”

He said: “We actually have evidence, within the last ten years not only has Russia been investigating the delivery of nerve agents for the purposes of assassination, but it has also been creating and stockpiling Novichok.”

Russia’s EU ambassador pitifully claimed the agent may have come from the MoD’s Porton Down laboratory — because it is about eight miles from Salisbury.

But Mr Johnson, speaking on the BBC’s Andrew Marr show, called Vladimir Chizhov’s suggestion of UK involvement in poisoning spy Sergei Skripal and daughter Yulia “satirical”.

3 Vladimir Putin wants to assassinate his enemies, Boris says Credit: AFP

3 Russian spy Sergei Skripal and his daughter Yulia are fighting for their lives in hospital

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Experts from the Organisation for the Prohibition of Chemical Weapons fly in to Britain today to test samples of the substance.

Last October it honoured Russia for getting rid of their stockpile of chemical agents.

Sergei, 66, and Yulia, 33, are still fighting for life in hospital.

​Russian ambassador Vladimir Chizhov​ ​says Porton Down could be the source of the nerve agent used in the attack in Salisbury