Did you try it? 
From the stims I've tried I liked them, like Ritalin and Adderall. Some say it's "too much" just to work out,, I say the caffeine use is out of control and feels dirty. Nazi Germany developed a drug for soldiers but it was never widely used because the war ended before it went into production. It was 3mg cocaine, 5mg meth and 5mg oxy in a pill. Now that's too much and would feel too good. 
Both sides in Ukraine accuse the other side of using drugs. In a meat grinder like that, what does it matter? I bet the vodka flows pretty freely too, not during combat perhaps but when they get a little time off.
The videos on telegram, what a nightmare for the soldiers.
God, no. I can't imagine it would feel pleasant for me at all. I have been to countries where chewing khat is as ingrained in their cultures as drinking coffee is in ours. The men
obsess over it but it's not something I really enjoyed. It's very mild, but if you chew enough of it you will get meth-like effects. I did it at some social gatherings but it just left me up all night in bed with a shriveled penis and a racing heart, completely unable to switch off.
I'd hate to be medicated if I were in a situation I needed to fight my way out of, but I suppose for
Brian Hankins untrained conscripts dying in a trench somewhere, having some oxycodone or meth might be a godsend, LOL. I've received morphine quite a few times for pain, along with diazepam for back issues, and I can see why people get addicted to those substances so easily.