If the nation which is using the banned weapons has signed the Convention, then yes its against the commitment that nation made when it signed the Convention for that nation to use banned weapons, even against a foe who has not.
A foe will tell you what you are doing wrong. An enemy never will. They're pretty muchm the same thing.
Killing the foe Pretty basic
There isn't one... the word 'enemy' has no gender.
Multiple hard to defeat opponents... A formidable foe would just be a hard to defeat opponent.
Prussia
The name Ghana was chosen foe the new nation to reflect the ancient Empire of Ghana that once extended throughout much of western Africa. Ghana means warrior king.
fun
yes , he was in 1993 a game knuckles was a foe but , then he is no longer a foe.
foe
If the nation which is using the banned weapons has signed the Convention, then yes its against the commitment that nation made when it signed the Convention for that nation to use banned weapons, even against a foe who has not.
foe
foe xoxoxoxo
A foe
foe there gross
foe to the plants
His foe was Al Capone.