Why do you have to occupy. Just bomb them into the stone age and send them a loaf of bread. Just limit their ability to attack you and let them rebuild themself. If they attack they must know what loosing means. It means No A/C, No Lunch, No Cars, No TV, No Computer, No Future. Their is no way to limit a war when your enemy is not united. A "faction" can do what it wants to.
Aden hotel used by Yemen goverment hit by grenade (Reuters)
from the article: Leaving the home front out of range