I think Hummus didn't go to war school. They're just regular folk that have been pissed off too much and now want some payback. They're evil and such, they just happen to know nothing about rules of war.

Until recently I, myself a total war removed, did not know that you couldn't use certain weapons. Like nuklier weapons seem generally not an option since the attacker can't even fly away fast enough to leave unscathed. But cluster munitions sound like a reasonable thing to use if you want the best chance at hitting something. However that's illegal to use for whatever reason. But again hummus would use those in a heart beat if they could. What about really powerful lasers, yeah those are illegal too. But for very little money they could be using them to blind the opponent from great distances. Koreans used powerful green lasers to blind security cameras during their protests. And now ruzzia seems to really want to drop a nuke somewhere. Like that's gonna help end the war. Instead doing something like that would force the hand of the US to take the war to moscow in a really shock and awesome fashion. I would expect for absolutely no building to be standing there in just a few hours of constant barrage.

Anyway, just to summarize, hummus has no clue what rules there are about war. And they probably don't care from what we can tell so far.