Russia has denied interfering with evidence at the site of a suspected Syrian chemical weapons attack that drew Western military retaliation.
In an interview for BBC’s Hardtalk, Russian Foreign Minister Sergei Lavrov said: “I can guarantee that Russia has not tampered with the site.”
Concern about tampering was raised by the US envoy to the international chemical weapons watchdog.
International inspectors are trying to reach the site in Douma, near Damascus.
The watchdog, the OPCW (Organisation for the Prohibition of Chemical Weapons), has been meeting behind closed doors in The Hague to discuss the alleged attack on 7 April.