The US State Department accused Russia Wednesday of having used a chemical weapon against Ukrainian forces in violation of the Chemical Weapons Convention, while also announcing fresh sanctions against Moscow. In addition to the chemical agent chloropicrin, Russia also used “riot control agents (tear gas) as a method of warfare in Ukraine, also in violation of the CWC,” the department said in a factsheet. “The use of such chemicals is not an isolated incident, and is probably driven by Russian forces’ desire to dislodge Ukrainian forces from fortified positions and achieve tactical gains on th…