'We have not established whether Salisbury nerve agent made in Russia
UK scientists have been unable to prove Russia made the novichok nerve agent which was used to poison Sergei and Yulia Skripal in Salisbury.
Scientists at the top secret army base Porton Down are unable to link the samples to Russia, after weeks of Moscow insisting it had nothing to do with the attack.
Theresa May's Government has repeatedly blamed the Kremlin and imposed sanctions on Russia, including the expulsion of 23 diplomats.
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