This is reported by The New York Times.

US Ambassador Nikki Haley believes that thus Russia once again proves its undisguised commitment to the military actions of Damascus against the common people. As a result, the working group that conducted the investigation of the incident on the use of chemical gas to combat IGIL is forced to leave the country, as its dandat ends this month.

Haley strongly condemned such actions by the Kremlin, adding that the next chemical attack in Syria, if any, would be on Moscow's "conscience".

As reported in the "URA-Inform", the UN Security Council recently rejected a resolution of Russia on the investigation of chemical attacks in Syria.