A November 1 Commerce FR notice has a good summary of Russian CW use in Ukraine, as well as the broader RCA issue:
The U.S. Department of Commerce is expanding controls under the EAR to include certain chemical precursors that are essential for the ‘‘production’’ of chemical riot control agents (RCAs) and chloropicrin that Russia has deployed against Ukraine in violation of the Chemical Weapons Convention (CWC). These new regulatory restrictions, which are specific to Russia and Belarus, aim to limit the use of these chemical precursors in the context of the war in Ukraine