You can be sure they have biological and chemical weapons that can kill within seconds of exposure.

Even North Korea has these chemical WMD's, they used VX a chemical nerve agent to get rid of Kim Jong-Un's half brother back in 2017. I don't even wanna imagine what kind of (A)BC weaponry America and the Western World is in possession of.

Here is Einstein's probability calculation about the deadliness of WW3:

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones