is Israel a signatory to that? It’s been strengthened with the following on bombing
To be legal, aerial operations must comply with the principles of humanitarian law: military necessity, distinction, and proportionality:[1] An attack or action must be intended to help in the military defeat of the enemy; it must be an attack on a military objective, and the harm caused to civilians or civilian propertymust be proportional and not excessive in relation to the concrete and direct military advantage anticipated.