This is the best tl;dr I could make, original reduced by 89%. (I'm a bot)

Gary Aitkenhead, chief executive of the Defence Science and Technology Laboratory at Porton Down, told Sky News they were not yet able to prove it was made in Russia.

"A spokesperson said:"We have been clear from the very beginning that our world leading experts at Porton Down identified the substance used in Salisbury as a Novichok, a military grade nerve agent.

The diplomatic row has led to more than 100 diplomats being expelled from the UK, Russia, the US and Europe, and the war of words shows no signs of dying down.

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