The alleged chemical weapons attack in Douma was a grotesque provocation by US-backed terrorists and their propaganda agents, known as the White Helmets.
Repeating recurring pro-Kremlin disinformation on chemical attack in Douma, Syria and the White Helmets. euvsdisinfo.eu/disinformation-cases/?text=douma&disinfo_issue=&date=
On 7 April 2018, a high number of civilians were killed in the besieged Syrian city of Douma, with evidence pointing towards another chemical attack by the regime, according to the EU.
According to the OPCW Fact-Finding Mission's preliminary report, various chlorinated organic chemicals were found in samples. No organophosphorus nerve agents or their degradation products were detected.
See also Bellingcat's open source survey on the suspected chemical attack: https://www.bellingcat.com/news/mena/2018/04/11/open-source-survey-alleged-chemical-attacks-douma-7th-april-2018/
On April 10 Russia vetoed a U.S.-drafted U.N. Security Council resolution that would have created a new inquiry to ascertain responsibility for chemical weapons attacks in Syria.
UN-OPCW Joint Investigative Mechanism found Syria’s Government responsible for last year’s attack in Khan Shaykhun.
In September 2017, the UN Commission of Inquiry on the Syrian Arab Republic summarized 33 separate incidents where it had found use of chemical weapons. Since then there have been several additional suspected chemical attacks. Between March 2013 and March 2017, the Commission documented 25 incidents of chemical weapons use in the Syrian Arab Republic, of which 20 were proven to have been perpetrated by government forces and used primarily against civilians.