Russia breached global chemical weapons ban in Ukraine war, US says 

FILE - Ukrainian servicemen take part in radiation, chemical and biological hazard drills, amid Russia's invasion of Ukraine, near Kharkiv, Ukraine Feb. 29, 2024.

The United States on Wednesday accused Russia of violating the international chemical weapons ban by deploying the choking agent chloropicrin against Ukrainian troops and using riot control agents "as a method of warfare" in Ukraine.