The article is about a Human Rights Watch reporting that Syrian officials used chemical weapons to attempt to take back areas outside of their control in Aleppo. Chlorine bombs were dropped in civilian residential areas, killing nine and injuring over 200. While Russia is helping Syria militarily, they found no link to Russian involvement with the chemical weapons.
http://www.reuters.com/article/us-mideast-crisis-syria-chemicalweapons-idUSKBN15S1W7