Lavrov gave an interview to The Washington Post on Tuesday after a meeting with his US counterpart John Kerry. Lavrov said he had used the meeting to hand over evidence proving Russia’s contention that chemical weapons were used by Syrian rebel groups in the controversial August 21 attack.
Russia investigated the alleged use of chemical weapons in the Syrian city of Aleppo on March 19 after a request from the Syrian government, Lavrov said, adding that its findings have been "broadly” made available to the United Nations Security Council and the public, The Washington Post reported.
"The main conclusion is that the type of sarin used in that incident [on March 19] was homemade, and we also have evidence that the type of sarin used on August 21 was the same, only of higher concentration,” Lavrov said, according to The Washington Post.
The United States, as well as Britain and France, said last week that a UN report into the use of chemical weapons on August 21 in Damascus confirmed their contentions that it was the work of the Syrian regime, Reuters reported.