Correction

The January/February 2015 article “Russia Extends Chemical Arms Timetable” misstated the conclusion of the report by an investigative team from the Organisation for the Prohibition of Chemical Weapons into allegations of weapons use of chlorine in Syria. In its report, the team said it had a “high degree of confidence” that chlorine had been used as a weapon, but it did not assign responsibility for the chlorine use to any party.