Russian foreign minister Sergei Lavrov has said the country has "plenty of evidence" that Britain staged the chlorine gas attack in Douma, including chemicals he claims were made in Salisbury.
In an interview with the state-run Rossiya Segodnya news agency, posted on the Foreign Ministry website, Mr Lavrov also alleged that videos showing people suffering the after-effects of the gas attack in the Syrian city were "staged by the White Helmets" rescue organisation.
He also accused the rescue organisation of terrorist links.
He added: "Also, just recently, our defence ministry's troops liberating Douma found a stockpile of chemicals produced in Germany, Porton Down and Salisbury, among others.
"Experts are now analysing the substances found there."