There's questions around the use of chemical weapons in Ukraine. But yeah its something that has to be investigated.
https://www.theguardian.com/world/20...main-sceptical
I mean the whole attack to me sounds weird, dropping something from the drone and only three people get hurt. Maybe its a choking agent like tear gas. But its not something more insidious like a blister agent, or even what makes up the main part of Russia's chemical arsenal which is Sarin, Soman or a really persistent agent like VX, which are really efficient killers and are persistent droplets instead of gas.