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.

Two Dutch intelligence agencies say that Russia is increasing its use of prohibited chemical weapons in Ukraine including the World War I-era poison gas chloropicrin.