Ukrainian authorities claim that Russia has dropped a drone carrying a toxic substance on the southeastern city of Mariupol. Ukrainian MP Ivanna Klympush tweeted that an “unknown substance” had been used in the city. Zelensky also voiced concerns that Russia forces could use chemical weapons in Ukraine. UK and the US have said that they will investigate reports of alleged use of chemical weapons in Mariupol. Meanwhile, Zelensky has said that Ukraine has become “one of the most contaminated by mines in the world”. Deputy PM Iryna Vereshchuk said that around 1,700 Ukrainian soldiers & civilians are held by Russian forces. A Ukrainian Rights Group has accused Russian forces of using rape as a weapon of war. Meanwhile, a Russian legislator has called Ukraine a “total war” and demanded an attack on NATO convoys.