United States of Palestine? it works in USA a huge country, nearly a continent. It also works in Suisse (CH) and as far as I know in Germany (landers). For Israel "a qtana"...Forget about this even if in theory it seems suitable. two-states yes but no "embedded" (morcellés) states.
Aden hotel used by Yemen goverment hit by grenade (Reuters)
from the article: One-state solution is a blueprint for a nightmare