Is it okay for some countries to use chemical WMDs?

Video emerges from Ukraine of the Armed Forces of Ukraine (AFU) adapting Domestic Drones to disperse WMD Chemical Hydrocyanic Acid against Russian Federation Troops in Soledar.
https://scotlandtoday.online/ukrainian-forces-use-airbourne-chemical-weapons-against-russian-troops-in-soledar

Do you remember how upset the U. S. and its puppets were over WMDs in Iraq and Syria? They bombed those places even without concrete evidence.

But now it's Ukraine doing it. How is that okay?
Can you imagine the hysteria if Russia used such weapons?

Updates
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My point is that it's hypocritical to completely destroy countries over suspicion of possessing WMDs. We were let to believe that it was a red line in the sand. But now we're looking the other way.

But now we see the truth of the matter. WMDs were just an excuse. But now we hear crickets when Ukraine gets busted using them.
Is it okay for some countries to use chemical WMDs?
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