"As the Council is aware, the intermediate timeline objectives have not been met. Syria is at critical juncture," the diplomats quoted Sigrid Kaag, the operation's coordinator, as warning the council.
"Delay is not insurmountable," she added. "But with deadline on the horizon, it is essential that Syria accelerates. Time for action is now."
Kaag is the coordinator of a joint operation set up by the United Nations and the Organisation for the Prohibition of Chemical Weapons.
Less than five percent of the most dangerous weapons have been removed from Syria, according to Washington, and Damascus has just missed another key deadline.