The videos recollected from a Russian military channel on Telegram show plumes of gas drifting near the soil produced by Russian strikes.

The same happens again in civilian areas :

And a gassing strike is also visible there :

According to an Ukrainian source, tests would have been already carried out by the Ukrainian armed forces in the first case and sarin recognized. The Russian forces also recognized implicitly the use : indeed the Russian telegram channel was showing an Ukrainian-flagged soldier with a hooked cross tatooed. They said to me they “gas the nazis”.

According to a reliable source from the UN Russia would have used S-metolachlore… the pesticide used typically for crematory processes in mix with depleted uranium or thorium, because it gives a good yield of fast neutrons. Let’s remind that weapons made like that are never as powerful as weapons made in a humane way, without killing. But it’s possible that the use of this particular gas largely used by Ukrainian forces in the past will mean that these attacks will remain taboo.