By Anthony Deutsch THE HAGUE (Reuters) -Ukraine asked the global chemical weapons watchdog in The Hague on Tuesday to investigate the alleged use of banned toxic munitions by Russia against its forces.

While it was already accused of using tear gas in its three-year war in Ukraine, German and Dutch intelligence agencies say Moscow has expanded its use of chemical weapons on the battlefield, including the use of potentially-lethal chemical choking agent chloropicrin.

Russia denies using the weapons, as does Ukraine; International body says previous accusations not “substantiated.”